MoBo/PSU Impossible Problem

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ko888
That MSI 945P Neo3-F motherboard is from the bad caps era. Check the aluminum electrolytic capacitors on the motherboard for any signs of leakage, bulging or venting. Other devices from that time period that use aluminum electrolytic capacitors may also be afflicted (e.g. PSUs, graphics cards)
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Polonium210

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Apr 15, 2014
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God dammit, working from an iPhone is not easy... Here's the problem I need help with :)


I have read numerous forum posts guiding me through my issues. However I think I am at a point where I need specific help. I will be grateful for any input.

I went on a fishing trip last weekend, and came home to a PC with no video signal. It sounded like it used to when booting - but without video output. Naturally I proceed to check the VGA cable and the DVI converter, I check the screen too with the VGA + DVI connection on a laptop, no issues.
Then I proceed to check the GPU, I had it packed into my cousins PC and it worked just fine.
At this point I think I have a PSU issue so I open the PSU (under safe precautions naturally), not the first time it's being opened, and all parts of the PC are not under warranty since it's old... Still rocking XP, hehe.
However after the PSU is cleansed from any dust and the entire rig is reassembled the PSU suddenly won't power the MoBo. I disconnected every connection apart from the 20/24 pin connector. I even left out the 4 pin PCI express connector - Still the same... The PSU ticks as the power gets turned on. Great, a new problem on top of the first. Now comes the part where my issue needs specific guidance:

I tested an ancient PSU I had lying around on the MoBo, it powers up like the original PSU did before disassembly. I tested the original PSU with the paperclip trick to see if it died from me messing with its internals... Paperclip trick runs the internal fan + an externally connected one.
Hmm, it sounds like a broken PSU. So use the ancient spare PSU from the test earlier to power the rig until a new PSU can be bought? Don't think so, the spare PSU doesn't boot with a video signal either.

Please help, dear forum
 
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leeb2013

leeb2013

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Aug 5, 2013
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ah, that's the real problem here!

seriously though, the type of problem you have is very difficult to diagnose, besides the obvious reseating and reconnecting everything. Generally, you have to swap out each component with a replacement, but when you have the potential of 2 issues, including a faulty PSU, then you also risk damaging other components in the process.

I guess as the PSU seams faulty, that would be the first thing to replace and work from there.
 
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Leebrandonhope

Leebrandonhope

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Apr 4, 2014
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I'd write off your PSU, that ticking noise is probably a shot capacitor. As said before your probably going to have to process eliminate everything. Though if theres no video signal I would only have imagined the GPU or possibly the motherboard. Not sure what else interfers with that kinda thing but maybe someone more experienced on here knows...

Chuck everything in the bin and buy a new PC.

 
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Polonium210

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Apr 15, 2014
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Ubrales, I have thoroughly read your guide and that was what I followed before the PSU started to make clicking noises.

Update
I don't own a multimeter to check the outputs sadly, however the ancient PSU I mentioned came from an old PC, that PC gets powered up by the ticking PSU. Peculiar thing is the ancient PC didn't want to establish signal either (tested on 2 monitors that both worked fine with the laptop)

I really have no idea what's going on, but I'm thinking I want to try and boot my rig with the PSU from my cousin's PC since that actually has a 6 pin power connector to the GPU.
 
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Polonium210

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Apr 15, 2014
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I tested the PSU from my cousin's PC on my rig, same ticking sound emits from the PSU. Both his and my PSU powered his PC fine.

I suspect it is the MoBo.

The weird thing is, the ancient PSU from the old PC I had lying around powers my rig, but still with no video signal.

So, any recommendations on affordable but sufficient motherboards?

My specs:
- 4x RAM PC5400 Elixir 1GB PC667.
- HD Seagate SATAII 500GB 7200rpm HDD.
- Nvidia GF 9600 GT Dual-DVI 512MB
- PSU Rasurbo 530W Silent PSU

And the motherboard
- MB775 MSI 945P Neo3-F ATX
Running: Intel Core 2 Duo E6700 FSB1066 4mb

 
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Ubrales

Ubrales

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Dec 3, 2009
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There is nothing to 'tick' on a PSU. The sounds are probably from something rubbing against the PSU fan blades.
 
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Polonium210

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Apr 15, 2014
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Ubrales, it's definitely the PSU, and it runs fine with the paperclip trick, even runs fine when connected to the old computer.
The shot capacitator proposal sounds reasonable, it's an electrical tick. Trust it can't be the fan.
 
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ko888

ko888

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Feb 18, 2009
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That MSI 945P Neo3-F motherboard is from the bad caps era. Check the aluminum electrolytic capacitors on the motherboard for any signs of leakage, bulging or venting. Other devices from that time period that use aluminum electrolytic capacitors may also be afflicted (e.g. PSUs, graphics cards)
 
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