Solved how can i check if desktop computer power supply is working

December 31, 2012 at 22:09:31
Specs: Windows 7
computer comes on, but monitor displays a no signa momentarly then goes blank/ have a gatway dx4200-09 model

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January 1, 2013 at 00:35:16
✔ Best Answer
That's unlikely to be a faulty PSU as it wouldn't affect just the graphics card.. More likely you need a new VGA cable or the graphics card needs re-seating in it's slot (unless it's integrated).

I have even seen that very same problem on a friends PC and it had me baffled so I took it to my local computer builder. He said the hard drive was faulty. He changed the hard drive, reinstalled Windows and it was fine after that.

Testing a PSU requires testing equipment like a voltmeter.

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January 1, 2013 at 03:21:56
Here is one person's way.
1st- Unplug your pc by removing the power cord from the back. Push and hold your start/power button while at the same time plugging it back in. This will start your pc.

Why is my screen black when I start Windows 7?

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January 1, 2013 at 11:24:22
Really bad idea to put the power cord in while having a electrical path via the on switch to the computer componets. This can put an electrical surge thru the system shorting it out.

It is also a misdiagnosis of the stated problem of no video.

Answers are only as good as the information you provide.
How to properly post a question:
Sorry no tech support via PM's

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January 1, 2013 at 14:53:19
'Really bad idea to put the power cord in while having a electrical path via the on switch to the computer componets.'
I agree fully on that

Some HELP in posting on plus free progs and instructions 7 Golds

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January 2, 2013 at 10:41:06
How do you even know the computer is running? Explain your logic so we can better understand.

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January 3, 2013 at 13:35:42
I have a longstanding problem that is similar to the original
poster's. It might even be identical. For me the problem is
intermittant and generally only occurs at power-on. After a
few seconds, or sometimes a minute or so, it goes away.
Usually, the video comes on when a "CLS" command is
done during boot, after the power-on self-test has finished.
Sometimes it doesn't come on until after the OS is running.
There were other symptoms too complex to go into here.

When I asked about it here, the first thing I was told was that
it might be a problem with the power supply. I thought it was
most likely a problem in the motherboard, which could have
been damaged when I tried (unsuccessfully) to install the
CPU cooler that came with my CPU. (I bought a different
cooler from a third party. Much better!) The reply here was
that it was unlikely that I damaged my motherboard. I dunno.

In my case, the computer is obviously running because the
power light is on, the fans are going, the single POST beep
is normal, the hard drive is accessed, and when the video
finally comes on, the boot is either progressing normally or
has completed normally. I expect that it is similar for the
poster here.

I have finally ordered a new power supply to see if that will
fix or change the problem. I still think it is more likely to be
the motherboard. I also have a new video board coming.
I really doubt the problem is with the video board, but that
*is* the most obvious possibility.

-- Jeff, in Minneapolis

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