Re: P3b-f won't boot,strange beep code help...please?
- From: "RobV" <robert@xxxxxxxxxxxxxxx>
- Date: Thu, 30 Aug 2007 13:05:45 -0400
jcazz wrote:
[snip]
Thanks for your input Rob,
I cleaned the system thoroughly and found an insect stuck in my video
card fan. Now Bios is reporting 5V leg sometimes fluctuates between
4.3-4.9. I think this is my problem now. The mobo light sometimes
blinks then crashes. Could the fan on the graphics cause the
fluctuation? IS this the PSU or mobo failure? I have a volt meter,
how do I check 5v leg on psu?
Thanks again
John
Ah, the old insect in the fan problem, eh? ;-)
Checking the voltage is easy with the link Andre gave for the ATX plug.
However, he did get the +5V and +12V colors reversed. Yellow is +12V
and red is +5V, with black being ground, of course. You can measure the
voltage anywhere there is access to the red and yellow wires. You can
get ground anywhere you can get to a black wire.
Yes, the fluctuation is bad, and is going way lower than tolerance would
allow. You may have a bad power supply, and/or bad capacitors: the big
electrolytic capacitors near and around the CPU. If you see any kind of
bulging on top of, or the sides of the caps, and/or light brown colored
crud on top of, or the bottom of any of the caps, then they are bad and
need replacing.
.
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