On Wed, 14 Dec 2005 18:04:41 GMT, "Charles Tosh"
<(E-Mail Removed)> wrote:
>Symptoms:
>
>A couple of weeks ago, my computer (with a 5-year old 250w unbranded PSU -
>the rest of it is about 2 years old) stopped turning on when I pressed the
>power button. A bit of turning off/on the power at the plug eventually
>persuaded it to turn on. It did this a few times and hasn't been a problem
>since. At the time I thought, "PSU's on its way out..."
>
>Today, the machine's been idling for a while, and I come to find it
>semi-frozen - the display looks like it does when you hold a cellphone
>that's in use right next to a monitor - and the cursor moves jumpily across
>the screen when the mouse is moved. Doesn't seem to accept any keyboard
>input, won't "do anything" in response to mouse clicks. I power off, power
>on - display is corrupted right from the first screen (BIOS information,
>POST). Boots into Windows, runs normally but with corrupted display, and
>then goes into that semi-frozen state again.
>
>I tried another monitor, same thing. I left it to cool down for a while,
>same thing. I throttled back the CPU, unplugged the hard discs etc - same
>thing.
>
>I then removed the graphics card (an NVIDIA GeForce FX5700 Ultra) and dusted
>off the cooling fan, the AGP slot, and the card itself. I also dusted the
>CPU fan a bit, but it wasn't really dusty.
>
>Following this, the display was almost normal when I booted up, and Windows
>looked fine until I ran a game. The opening cutscene was slightly
>corrupted, the menu display very corrupted, and the in-game display was
>utterly whacked out. The PC ran fine after returning to Windows, but the
>display never cleared up again, until I rebooted. Then same thing - fine
>until I ran a game, corrupt afterwards.
>
>I'm a bit stumped now. I'm not sure where the problem lies. I'm assuming
>it's not a driver fault because the display was whacky even before loading
>Windows, and I don't have much experience with hardware problems.
You've been using a poor generic PSU that's unsuitable for
the system... at this point you may have worn out capacitors
and damaged several parts and to nail this down you will
have to try all parts isolated- easiest done with a 2nd
compatible system for parts substitutions.
First thing I'd do is get a better power supply and just try
the system. Continuing to use this questionable one and
diagnosing parts acting up (possibly due to) with poor power
could leave the initial problem.
Inspect capacitors on the motherboard, and in the power
supply after having left it unplugged from AC for several
minutes. Take voltage readings of the power supply output,
at the connector to the motherboard with a multimeter, NOT
on the open PSU unless you are competent to do so.
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