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Hi, one of my client computer could not be power on. When I connect the system unit to the power and turn it on, i found the power is come into my system unit. I also found that the ligh of the hard disk is available after that around 1 mintus the light of the hard disk is turn off but the system is not boot up. The monitor is not display anything. The system unit still has the power but its seem like the hard disk is not running at all.
Could you please let me know what is the cause of the problem? It is cause from the hard disk that is not functioning?
Thank in advance!!
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Mekong River wrote: Could you please let me know what is the cause of the problem? It is cause from the hard disk that is not functioning?
Well we could guess, but it is impossible to diagnose a hardware problem without access to the actual machine. If you don't have the knowledge to find out which component has failed then you should consult an engineer or take it to your local computer shop.
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Does the computer make any beeps after the bios has started?
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No. It didn't alert any sound. Any idea?
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That usually means that the PSU,CPU or the MB is broken.
Other errors are usually alerted by different combinations of beeps. One beep usually means that bios has booted OK.
Note my use of the word usually, there are known exceptions.
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I have takeen this computer to the computer shop and they told me that the problem was the mainboard that is broken. But after I replace mainboard and used it for two days, now i found that there is no electricity come into the System unit. I try to change many power cable but it was not success. Could you please let me know what is the cause of the problem? Is it related to the power supply? Do you know are there any tool that I could test the power supply?
Thank in advance!!!
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Does your PSU have a power switch on the back?
You can turn an ATX power supply on by shorting the green pin of the ATX plug to one of the black ones. You need have a bit of a load on the PSU while doing this though (without it you could damage the PSU); either leave it connected to the PC or have a few case fans attached. If the mobo has failed it won't turn the PSU on when you hit the power switch. It's far more likely that either the PSU has failed, or that the mobo has failed than your power cord is bad.
If the mobo died after two days there's a good chance that your PSU is faulty and killed both boards. You can check voltage levels with an inexpensive multimeter; but would need access to an oscilloscope to measure voltage ripple/startup spikes that a cheap PSU could fry a board with.
3x12=36
2x12=24
1x12=12
0x12=18
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I got a "MS7120 Orbit Omni-Directional Laser Barcode Scanner". I plugged it into my PC. When I scan the bar code in the instruction book, it beeps. My question is, where and how do I get the "output" data from the scanner? Is it written somewhere in a file? I have no idea (never used one before).
Thanks.
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Depends on which interface (and settings) you're using. If it's a keyboard interface you get the barcode as characters typed from a keyboard.
If it's RS232 you can probably use the System.IO.Ports.SerialPort class.
The USB interface can emulate both keyboard and serialport.
So it's quite versatile and up to you how to use it.
But there is no shortcut past reading the documentation. If you don't have it it's avaliable at Honeywells[^] homepage.
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Jörgen Andersson wrote: But there is no shortcut past reading the documentation.
That's what I was afraid of. 
Do you mean, I need to write some code that picks up what the scanner produces from the serial port? Sounds fun.
Thanks.
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Hello guys,
Today i just received the Monitor that i just bought. Now the problem is here the monitor accepts 3 different types of inputs which are DVI , HDMI , and VGA, and in my computer i have the 9800GT which has 2 DVI connections. So i went to my local computer shop and bought a DVI-D to HDMI cable so I can connect the monitor via HDMI to get the best picture possible. Now what happened is when i connected the cable to the monitor no picture was coming up but when used the VGA cable with the DVI extension everything worked. I did some research to try and fix the problem and it resulted that my graphics card accepts DVI-I connections and the wire is DVI-D and these are different as i think. Do you think this is the reason that the monitor didn't work when i connected the cable and do you think there is a transformer that can switch from DVI-I to DVI-D or are there DVI-I to HDMI cables? any help would greatly be appreciated guys.
Regards,
Christian Pace
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DVI-I connectors/cables support both analog and digital inputs. This isn't your problem. What I think is hte issue is that your monitor is set to get input from the analog port not the hdmi port. Depending on your model there should either be a button to switch inputs directly or it's an option in the screen menus; unless you have a very cheap model it's probably the former. The button will cycle between the three inputs in sequence.
The latest nation. Procrastination.
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Good day,
My desktop PC's been dead for a few months now (I have a laptop as a replacement).
I decided that I should take some time to try to fix it.
When powering up the machine, nothing happens, the fan of the power supply does not even turn on, neither does the case fan that is directly plug into the power supply.
Question : are the fan controled by the motherboard ? i.e. if the MB is fried, should the fans (especially the power supply one) turn ?
Thanks.
Summary:
Got to a (good) store with the old PS, they checked it out, and was dead; no power at all...
Went home with a brand new PS unit, more wattage, cool looking cables; installed it, did not
blow fuses or mother board or graphic card...
Booted up Vista, spend a few hours updating updates (it's been dead for a couple of months)
Rebooted and spent the rest of the week-end playing Fallout 3.
This signature was proudly tested on animals.
modified on Monday, October 19, 2009 8:56 AM
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Maximilien wrote: Question : are the fan controled by the motherboard ? i.e. if the MB is fried, should the fans (especially the power supply one) turn ?
I think that the power supply fan should always come on if there is power coming in through the mains. Are you sure you are getting power in to start with? Second thing to check is whether the power supply unit is passing current out to the MB and other components. Do you have an AVO meter, or a friend with one?
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I would look for a fuse near the rear power switch, and check it.
Luc Pattyn
I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages
Local announcement (Antwerp region): Lange Wapper? 59.24% waren verstandig genoeg om NEEN te stemmen; bye bye viaduct.
modified on Sunday, October 18, 2009 4:45 PM
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IF the PSU is under warranty opening it to check for a fuse will void it.
The latest nation. Procrastination.
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Overhere the fuse often is a user-serviceable part, with the fuse holder, power switch and inlet integrated in a single module[^].
Luc Pattyn
I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages
Local announcement (Antwerp region): Lange Wapper? 59.24% waren verstandig genoeg om NEEN te stemmen; bye bye viaduct.
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That's odd; my two most recent PSU purchases had no user serviceable part/warranty void if opened stickers on them. The justification for the 100-240v 50-60hz (switchless) design I've seen has always been so that they could sell a single model globally; but if they're making your model with a user serviceable plug that's clearly not the case. 
The latest nation. Procrastination.
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all the user can (or is supposed to) do on the model shown is uncover the fuse holder and check/replace the fuse. This could/would still be a wide range power supply, that could be used everywhere provided it comes with a cable that fits your wall's power plug.
Luc Pattyn
I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages
Local announcement (Antwerp region): Lange Wapper? 59.24% waren verstandig genoeg om NEEN te stemmen; bye bye viaduct.
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My point was that the US models are being sold without a removable plug so we're still not getting the same one that you are.
My most recent PSU purchase[^]
The latest nation. Procrastination.
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Yes, that is what I expected: they design and build PCs that are "universal" and could work mostly everywhere by solving the cord/plug issue; and then have a few variants to best fit the local market.
Luc Pattyn
I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages
Local announcement (Antwerp region): Lange Wapper? 59.24% waren verstandig genoeg om NEEN te stemmen; bye bye viaduct.
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Hi,
I'm in a very difficult situation. 
I want to read the CPU Fan speed from the machine running Windows OS.
WMI provides Win32_Fan class for doing this. But as far as i know, its is not implemented by Microsoft.
(i think so !!)
googling doesn't help me much.
But i saw the CPU Fan speed value on the BIOS > Hardware Monitor > CPU Fan speed/System Fan Speed. Its a read only value.
So, i think it is possible to read that value from BIOS. But i don't know how.
Please help me
Thanks is advance
BIJU
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BIJU Manjeri wrote: googling doesn't help me much.
Did you try this[^]?
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Hi,
The available hardware information is limited to what the vendors provide. WMI gives a framework to access what is available.
Here is what one of my systems returns for Win32_fan, there is no speed info:
1: ActiveCooling = "True"
1: Availability = "3"
1: Caption = "Cooling Device"
1: CreationClassName = "Win32_Fan"
1: Description = "Cooling Device"
1: DeviceID = "root\cimv2 0"
1: Name = "Cooling Device"
1: Status = "OK"
1: StatusInfo = "2"
1: SystemCreationClassName = "Win32_ComputerSystem"
1: SystemName = "LP1720"
Luc Pattyn
I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages
Local announcement (Antwerp region): Lange Wapper? Neen!
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It IS implemented by Microsoft. That's why you even have the class in the first place. The problem is that the Fan class does not provide the speed information. You would have known this if you read the documentation on the Win32_Fan class.
There is no Microsoft-supplied class that returns CPU speed. This would be provided by the manufacturer of the motherboard, IF AT ALL! You'd look in a different namespace with the WMI class for one of these, not in root\CIMV2.
For example, on my HP desktop machine, the namespace to find the HP supplied class for fan speed is in root\HP\InstrumentedBIOS. The full class path is HP_BIOSSensor\HP_BIOSNumericSensor\HPBIOS_BIOSNumericSensor. The machine I'm on supplies 4 instances of the HPBIOS_BIOSNumericSensor class. The first instance returns the CPU fan speed, the second is the chassis fan speed, the third is the CPU temp, and the forth is chassis ambient temp. These values are not returned at normal temperature and speed values, but values on a mapped scale. Since there is no documentation on these scales (that I can find right now), I'd have to do some research into what those values scale to and what they really mean.
Not all motherboard manufacturers supply this kind of information through WMI. In fact, most do not.
Oh! Where did I get this information?? It wasn't with Google or some mystical oracle. I used this little tool[^]. It's a MUST HAVE for doing WMI work.
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