Re: Faulty Motherboard or power supply (or both)
- From: Ken <user@xxxxxxxxxxxxxx>
- Date: Tue, 13 Jun 2006 20:03:27 GMT
kenmor wrote:
I built my machine about 2 and a half years ago based around a
Gigabyte GA-8S655FX-L motherboard (socket 478) with a P4 2.4 GHz
processor. I am not an experienced techie and I have no
sophisticated test equipment.
It went wrong a few weeks ago and having considered several
possibilities. I am fairly sure that it is the motherboard, processor
or possibly power supply at fault, but I would appreciate any comments
especially on the power supply (see below).
After switching on there is power as the fans operate, at least one
LED is lit and there is power to the USB optical mouse (the laser
shows red). This means I am getting basic power but the 12V power
could still be faulty I suppose.
There are no POST messages or beeps, and there is no attempt to boot
from an inserted floppy. The lack of beeps or boot reading of floppy
would seem to rule out the video card.
I have replaced the CMOS battery with a new one (leaving the battery
removed for some time so that I get the default BIOS).
Removing memory modules makes no difference. (Still no POST or
beep).
I have tried making sure all connectors and cards are firmly seated.
This seems to be probably a motherboard problem (do you agree?) but I
wanted to check the power supply and so I got another one (both are
well up to spec). This starts out the same but the power goes off
after a few seconds i.e. the fans start and then stop. Is this likely
to be the power supply reacting somehow to the motherboard being
faulty or is my second power supply likely to be faulty even if the
first one isn�t? I want to get to the bottom of this because I am
not keen on buying a new motherboard if this is not the problem.
Any comments would be much appreciated
As others have suggested, you must establish that SOMETHING is good. Davy hinted that you can simplify your problem by removing some items. That is what I would do to find the problem. Disconnect your HDs, DVD/CDs, floppy disk drives and any other plugin cards or cables not necessary to see a video output. You could have a component pulling down the PS and by removing it temporarily establish what component it is.
Once you have something on the monitor you can add one component at a time to see which one is causing your failure. Also make sure the processor fan is plugged in properly. Some MBs shut everything down when no current is detected by the circuit providing the current for the fan. Make sure your RAM is good also, as although many will sound an audible error code for no RAM or failing RAM, I am not sure all will.
The suggestion of faulty caps on the MB is also a good one. Simplify your problem to the lowest possible level, or test some of the critical items (RAM, PS, CPU) on another MB in order to establish if they are OK.
.
- References:
- Faulty Motherboard or power supply (or both)
- From: kenmor
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