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[Solved] PC Wont power up...Completely Stumped. Suggestions on new Board Please.

post #1 of 12
Thread Starter 
OK...so this PC is about 11 months old. About a week ago, it was on when I left the office, and when I got back in the morning...it was off. Pressing the power button did nothing. No lights, no sounds, no fans, nothing.

Having seen this before with dead PSU's...I foolishly went and bought a new new PSU without doing any further testing. Brought it home, installed the new PSU, and....same result. This time however, I noticed a light on the motherboard light up for an instant...and then turn off. If I turn off the PSU, and try to power up again...I again see the light for a mili-second...but then it's gone.

So - I try to bypass the power button (shorting the power on pins) with the same result....so I figure it MUST be a dead mobo. So - back to Fry's to return the PSU and pick up a new Mobo. I install everything again and...the system boots as normal. Assuming my troubles are over...I go downstairs while windows grabs a couple of updates.

I return 20 minutes later...and the system is off. It will not power up and f I unplug it (or turn off PSU) and restart...I can see a light for the briefest of moments...and nothing.

SO - I AM LOST

We know that the Motherboard (new one at least) is/was good.
Power Supply Is good.
Changing RAM makes no impact - so I am assuming they are good.
GPU works in other system...so assuming good.
System wont power on with or without HDD's installed

So - am I left with only the CPU? Is that even possible.


PLease please please help...if you have any ideas for me.

System Specs:
AMD Phenom x6 1075
Zalman Cooler
MSI 870-G45 mobo
Xigmatek 500W 80 PLUS PSU
PNY GTS 450
Ballistix 1333 DDR3 (2 x 2GB)
Edited by clbkdaz - 2/26/12 at 7:24pm
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post #2 of 12
Hi mate. Had this happen to my sig rig a while ago. No lights no beeps and no post!! It worked a few hours earlier was shutdown correctly etc. I fixed it by totally stripping it down to the component parts cleaning any and ALL connectors with 99% alcohol and refreshing ALL thermal interfaces (NB MosFets SB) on the MoBo. and new paste for the CPU.

Not sure which of these actually fixed the issue BUT even resetting the BIOS to default didn't help i was thinking the worst to be honest!! BUT when i pushed the power button and it beeped you could feel the JOY!!biggrin.gif.

Not trying to insult your intelligence but if it is installed in a case are you sure that there isn't an extra standoff or anything else shorting out? maybe try building up rig on MoBo box etc?

Also do you have a surge protector? If not it might be a good idea to purchase one (when the rig is fixed) as a good power surge can hose a rig and you never see the effect.

Thanx.
    
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post #3 of 12
Make sure you check your cpu if it is properly attached, this was my issues when this simulair problen accured
post #4 of 12
This happened to me a long while back. PSU worked fine, HDD worked fine, GPU worked fine. RMA'd mobo and it still didn't work, replaced CPU and it worked fine for a month or so then a stick of RAM went bad. So I RMA'd the RAM and all was well again smile.gif

It's probably that CPU paired with that Mobo causing the problem. Not regulating the power right, something about only having 4 power phases on that mobo which isn't recommended for 125W+ CPU's such as that X6.

What I'm getting at, RMA that CPU and disable 2 cores along with undervolting/underclocking it, or get a lower wattage CPU.
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post #5 of 12
I know the Xigmatek is the 2nd PSU you bought (right?) but having owned 2 of them, they randomly shutdown like crazy. Junk.

It could STILL be the PSU.
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post #6 of 12

Unplug the CPU power connector..... see if it boots

x6 + that motherboard = really bad idea due to high VRM failure rate due to bad design.  I wouldn't be surprised.

See the link in my sig: About VRMs & MOSFETs, for more info about what these VRM failures are and why it happened to you.

 

By the way: What is your heatsink? Stock heatsink? CPU speed at stock speed as well?


Edited by xd_1771 - 2/26/12 at 1:14pm
post #7 of 12
Thread Starter 
Ok guys...thanks for all of the input. I have been checking from my mobile all day, but havn't had a chance to sit down and respond till just now.

Look s like Boom50Cal and xd_1771 got the answer here. If I unplug the 4-pin connector...the fans spin up and stay on...so it would appear that you can safely add me to your VRM failure list.

The first board took 11 months to die...the second board took 11 minutes.

So - now the real quandry. i need this system back up and running for the office tomorrow...so I will be stopping back at Fry's to exchange the new dead 870-G45. Any suggestions for a replacement in the $80 - $100 category? This is my work PC...so it does not need to overclock, but - I do need an ATX form factor.

Again - all help appreciated.
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post #8 of 12

:/ Oh great, another two stock speed failures.  Eh, the record proves itself sometimes redface.gif you should be avoiding using any low end MSI boards for use with 125W AMD quad and hexa core processors because these boards are really often not ready for this kind of power load due to widespread design faults including low quality fets, poor pass standards, poor layout (third transistor), and total lack of VRM over-current protection.  There is already a reasonble record of MSI 870 boards failing on stock speed 125W processors and your situations add to that record.

 

ASUS M5A97 at Fry's - best bet, overclocking-ready if you need it.  None of the boards below this in cost (unless you count rebates then the 970A-D3 is an option for $90 AR but it's not overclocking ready due to lack of VRM cooling.... plus, eh, rebate) are not nearly as suitable.

 

What CPU heatsink were/are you using?

post #9 of 12
Thread Starter 
I have a Zalman CPNS cooler on there. I think its the 7500 one. Been a while since I bought it and cant find the box...but it seems to work better than the stock cooler.

I'll just have to see whats in stock @ Fry's tomorrow and go from there.

Thanks Again for the input
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post #10 of 12

Oooh, that's also a downward blowing cooler. Which means this failure would've occured despite the presence of airflow VRM cooling.  A further hint that the problem is more likely attributed to design, lack of capacity and long-term degradation than lack of cooling.

Thanks for the info!

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