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Dying PSU?? Help!

F

fuzzbutt99

Weaksauce
Joined
Sep 7, 2004
Messages
97
I've been having problems the last couple days when cold booting my pc. I hear the hard drive spin up, but the screen remains black and my monitor never shows anything and acts like there is no signal.

The first time this happened I switched out the motherboard and hard drive and I got the same problem. However, the next day when I restarted my pc the display came up as normal.

I'm thinking this must be a PSU issue? I just got a 470watt Enermax Noisetaker. Today when it didn't start I turned the PSU fan to low and then it restarted fine, perhaps it was a coincendance or perhaps not.

My motherboard monitor readings look a little low don't they? Or is this usual?


+3.3 : 3.312
+5.0 : 4.08
+12.0 : 11.4304
-12.0 : -7.25568

:eek:
 
A computer won't run with the +5V rail @ 4.08V, and this wouldn't be the first time that a mobo read the voltages wrong. Get a digital voltage meter, even a super-cheap one, and take direct measurements.

It's possible that your problem was nothing but a loose connection or a short between the mobo and case, and mobos aren't guaranteed to not need insulating fiber washers around the mounting holes. Also leaving out supports can let the mobo flex enough to short, especially at the corners (I install them in the mobo even if there's no matching place in the case).
 
larrymoencurly said:
A computer won't run with the +5V rail @ 4.08V, and this wouldn't be the first time that a mobo read the voltages wrong. Get a digital voltage meter, even a super-cheap one, and take direct measurements.

It's possible that your problem was nothing but a loose connection or a short between the mobo and case, and mobos aren't guaranteed to not need insulating fiber washers around the mounting holes. Also leaving out supports can let the mobo flex enough to short, especially at the corners (I install them in the mobo even if there's no matching place in the case).
Click to expand...

I switched out my PSU with my old one and got the same reading in MBM. When looking at the voltage readings in bios it looks more online with what it should be. I'm going to borrow my friends voltimeter to check it out.

But it looks like the cause may be one of the metal flange thingies that cover up the open PCI slots was touching my mobo which was shortening it out. Figures as much. At least my mobo is still working, hope it didn't fry anything :(

This makes since though since it would sometimes boot up while the case was laying flat vs when I moved it around to stand up. I'm going to get some fiber washers also, just in case. Thanks man!
 
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