Fitted New PSU, System Not Booting?

Greenlizard0 · 20 Feb 2008 at 15:00

I have just fitted as many connections as I think I needed to just boot up my system to check my new PSU is ok. I put the two larger 24 pin plugs in and the smaller 4 pin plug in by my CPU. The trouble is now the PSU and CPU fans turn on for a second and then flicker out.

Is this down to a faulty motherboard? Also quite bizzarely my previous PSU had a PSU fan connected to plug into the the motherboard - this new one doesn't. Should there be one?

MB: Asus M2E-E
New PSU = Zalman 600W heatpipe

BillytheImpaler · 20 Feb 2008 at 15:08

Greenlizard0 said:
Also quite bizzarely my previous PSU had a PSU fan connected to plug into the the motherboard - this new one doesn't. Should there be one?

No, most have internal fan speed control these days.

What was wrong with your old PSU? Did it die? Might it have taken out the motherboard as it shuffled off this mortal coil?

Greenlizard0 · 20 Feb 2008 at 15:16

BillytheImpaler said:
No, most have internal fan speed control these days.

What was wrong with your old PSU? Did it die? Might it have taken out the motherboard as it shuffled off this mortal coil?

1)Cheers, that thought had crossed my mind

2)It pretty much just croaked it. I unplugged the new PSU and replugged the older one - and the green indicator LED on the motherboard doesn't even turn on - and of course neither does the machine boot up at all.

I replugged the 3 power cables and the graphics card 6 pin plug and tried turning the machine on - and the PSU fan and CPU fan spin up for about half a second and then gently whirr down. I'm thinking that when the PSU died, it may well have taken out the motherboard :mad:

Greenlizard0 · 22 Feb 2008 at 19:05

Ugh god almighty can anybody help with this problem please?

I have just replaced the motherboard, and the same thing happens - the green LED on the new motherboard lights up - as soon as I press the power button, the fans start whirring for less than a second - and then power off. The green LED remains on all this time - yet I get no life from my machine

Being that I have replaced my motherboard - everything was taken out and dusted down as so to speak.

Any help offered would be awesome. I know this might sound weird - but is it possible (scraping the bottom of the barrel here - that I might have a faulty power switch from the case? *Frowns*)

Spec is as follows now:

AMD Athlon 64 X2 Dual Core 6000+ 3.00GHz (Socket AM2)
Zalman CNPS9700-LED CPU Cooler
Asus M32A32 MVP Dluxe Motherboard
GeIL 3GB (2x1GB) PC2-6400C4 DDR2
Zalman 600W PSU (Brand New)
2x36GB Raptors in RAID0
2x500GB AAKS' in RAID 1
X-Fi Fata1ty Sound Card
GFG OC2 640MB 8800GTS (Older type)
2xSamsung Black DVDRW Drives
Black floppy+multicard reader

RJC · 22 Feb 2008 at 19:30

Just to check, you have connected all the power cables securely and any that may be needed.
Try clearing the CMOS and only have minimal items connected, ie one stick of RAM one HD ect, if that fails try different RAM sticks.

If that fails remove the motherboard place on a non conductive surface then reconnect minimal items to rule out possible shorting.

Failing that I have no idea

, try another PSU.

Good luck Rob

Greenlizard0 · 22 Feb 2008 at 19:36

Sorry but what will clearing the CMOS do? The motherboard is brand new..

I have tried powering on without any of the optical/hard drives connected up and only the graphics and sound card plugged in.

This is such a bizarre problem I might have to take the machine down to a repair shop or something :/

RJC · 22 Feb 2008 at 19:43

Greenlizard0 said:
Sorry but what will clearing the CMOS do?

I have tried powering on without any of the optical/hard drives connected up and only the graphics and sound card plugged in.

This is such a bizarre problem I might have to take the machine down to a repair shop or something :/

Clearing the CMOS will set everything back to defaults, I often do this when installing new memory or CPU, something I do personaly especialy with a new motherboard it does sometimes work.

Rob

Greenlizard0 · 22 Feb 2008 at 19:49

Right ok I'll give that a try tomorrow. I desperatly need a beer :/

Are there any other ideas please?

Greenlizard0 · 23 Feb 2008 at 15:30

Monkeynut · 23 Feb 2008 at 15:43

Have you tried with every PCI card out and a space GFX card?

Greenlizard0 · 23 Feb 2008 at 15:54

I've only left the graphics and sound card in atm. I have also tried with nothing (optical/hard drives) connected up.

I have just tried swapping power cables around but to no avail. I've even tried plugging straight into the mains as well but nothing changes.

I might try and upload a video to show exactly what happens...

Greenlizard0 · 23 Feb 2008 at 15:57

RJC said:
Clearing the CMOS will set everything back to defaults, I often do this when installing new memory or CPU, something I do personaly especialy with a new motherboard it does sometimes work.

Rob

Struggling to find the info I need to do this? *frowns* It's not in the manual...

edit - being a noob sorry found it.

jonhuz · 23 Feb 2008 at 16:56

Funnily enough, I'm taking a road trip tomorrow for a pc I sold, that is displaying the case problems as you.

The power turns on for a second, fans whirl up, then nothing. Although the mobo green led is on. In order to get the power back, an unplug from the mains is necessary.

I'm trying to narrow possible reasons why, before I go up. So far it's the psu is dead and there's some residual charge making it through. The case is shorting. Or the case power button is dead.

Greenlizard0 · 23 Feb 2008 at 17:09

jonhuz said:
I'm trying to narrow possible reasons why, before I go up. So far it's the psu is dead and there's some residual charge making it through. The case is shorting. Or the case power button is dead.

I have just cleared the CMOS but nothing changes.

It's a totally bizarre situation to be in -I can't figure out for the life of me why this is happening. I'm starting to think that perhaps the power button is dead. God I've never had to RMA a case before.

Why would the case be shorting? I note that mine is off the ground on plastic feet. Could this be affecting it?

RJC · 23 Feb 2008 at 17:19

Greenlizard0 said:
I have just cleared the CMOS but nothing changes.

It's a totally bizarre situation to be in -I can't figure out for the life of me why this is happening. I'm starting to think that perhaps the power button is dead. God I've never had to RMA a case before.

Why would the case be shorting? I note that mine is off the ground on plastic feet. Could this be affecting it?

The motherboard could be shorting on your case via screw head or something metal touching the motherboard, hence the reason for suggesting removing your motherboard from the case and runnning external, at least you know you have safely tried all possabilities.

jonhuz · 23 Feb 2008 at 17:21

Have you tried building outside the case?

Build the mobo on top of it's box, that should remove the possibility there's a short somewhere.

Greenlizard0 · 23 Feb 2008 at 17:29

Hmm the only things that the motherboard is touching is the screw heads themselves...and the graphics card plugged in is of course touching the rear of the case.

Why on earth would this problem arise? Can i not discharge the case or something?

RJC · 23 Feb 2008 at 17:35

When you changed the PSU with your original motherboard you could have moved it slightly or upset a stand-off ,
when you installed the new motherboard the fault is still there, without going through these motions no one can really tell.

Greenlizard0 · 23 Feb 2008 at 17:55

Nope -just tried building outside on the motherboard box and the same thing happens. Do I have to completely take the motherboard out of the case? Or is putting the cardboard box ontop of the case and under the MB be ok?

Greenlizard0 · 23 Feb 2008 at 18:04

I've just noticed then now I've turned the radio off - but when the power plug is plugged into the PSU and I switch the rear switch on - there is a very slight high pitched whine. It's very very slight and not loud at all..

Fitted New PSU, System Not Booting?

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