Overclock.net › Forums › AMD › AMD - General › Computer won't post after PSU replacement
New Posts  All Forums:Forum Nav:

Computer won't post after PSU replacement

post #1 of 6
Thread Starter 
Hello and thank you for any input/advice/help you may have after you read this.

Recently, I decided to upgrade my sigrig with a new Switch 810 and Corsair AX850. I drained my loop, moved all of the hardware, filled the loop while running the pump, let the pump run over the weekend while out of town, and finally connected all of the power cables.

Hears where I get scared:

When I first powered the computer up, there was a small popping sound, then I thought I saw a little bit of smoke come out of a fan duct. "oh *****"
I killed the power and got a flashlight out. I looked around at all of the parts but didn't see anything out of the ordinary. So I thought "maybe the smoke was just some loosened dust." I tried to power it on again.

No pop, but no bios or image on the screen.. crap.. Troubleshooting..

The psu seems fine. all fans are on, pump is good, leds are good, video card seems fine. I started switching out for known parts. I switched out the memory one stick at a time, and then the video card. I didn't switch out the psu because I don't have another laying around, but I did whip out the fluke and measured the voltages from the motherboard's nodes.

cpu: 0.8V (I assume this is idle before the bios?)
cpu_pll: 2.53V (not sure what this is..)

At this point in time, I have come to this conclusion:

When I had my old psu, I had a certain voltage on my cpu in the bios that wasn't actually being reached maybe because the psu wasn't reliable. When I put the Corsair psu (known for reliability) it simply overvolted the cpu, because, like an idiot, I didn't clear the cmos before turning it on. I took the block off and removed the cpu. The socket and pins seem to be ok.

I really have no idea what it is and I would like to know what you guys think I should do next? Try something else? replace the board? cpu?? or both???

I have been considering moving over to Intel but I don't really want to buy a new mobo/cpu if I don't necessarily have to. I'm trying to afford a wedding right now so money is really low.

Any insight would be much appreciated frown.gif

-Chris
post #2 of 6
I would take the whole rig out of the tower... inspect the back of the board, make sure you didn't short something out (visible burns anywhere). Put the mobo/cpu and one stick of RAM on the mobo box, try booting like that. If it boots, you simply had it mounted in the case wrong and you were shorting it out.
Beast of Burden
(19 items)
 
Cool story, bro!
(16 items)
 
 
CPUMotherboardGraphicsRAM
i7 3770k Gigabyte Z77X-UD5H Gigabyte HD 7970 Reference Ripjaws Z 
Hard DriveHard DriveOptical DriveCooling
Crucial M4 Caviar Black ASUS DVD XSPC Raystorm 
CoolingCoolingCoolingOS
EK FC-7970 w/ Backplate Copper/Acetal RX360 w/ 3x Yate Loon High Speed in Push XSPC Dual Bay Res w/ D5 Pump Windows 7 
MonitorMonitorKeyboardPower
ASUS VE226H ASUS VE226H Cooler Master Quickfire Rapid Corsair HX850 
CaseMouseMouse Pad
HAF 932 Advanced Razer Deathadder QcK Mini 
CPUMotherboardGraphicsRAM
Q9550@ 3.5GHz w/ 1.191v Gigabyte GA-EP45-UD3P Sapphire Reference 5850 @ 775/1100 G.SKILL 4GB (2 x 2GB) DDR2 1066 
Hard DriveHard DriveHard DriveOptical Drive
Crucial C300 Spinpoint F3 Caviar Black ASUS DVD-RW 
CoolingOSMonitorKeyboard
Arctic Cooling Freezer 7 Pro Windows 7 Home Premium 64-bit Samsung 23" Saitek Eclipse III 
PowerCaseMouse
Corsair 430W NZXT Source 210 Wolf King 
  hide details  
Reply
Beast of Burden
(19 items)
 
Cool story, bro!
(16 items)
 
 
CPUMotherboardGraphicsRAM
i7 3770k Gigabyte Z77X-UD5H Gigabyte HD 7970 Reference Ripjaws Z 
Hard DriveHard DriveOptical DriveCooling
Crucial M4 Caviar Black ASUS DVD XSPC Raystorm 
CoolingCoolingCoolingOS
EK FC-7970 w/ Backplate Copper/Acetal RX360 w/ 3x Yate Loon High Speed in Push XSPC Dual Bay Res w/ D5 Pump Windows 7 
MonitorMonitorKeyboardPower
ASUS VE226H ASUS VE226H Cooler Master Quickfire Rapid Corsair HX850 
CaseMouseMouse Pad
HAF 932 Advanced Razer Deathadder QcK Mini 
CPUMotherboardGraphicsRAM
Q9550@ 3.5GHz w/ 1.191v Gigabyte GA-EP45-UD3P Sapphire Reference 5850 @ 775/1100 G.SKILL 4GB (2 x 2GB) DDR2 1066 
Hard DriveHard DriveHard DriveOptical Drive
Crucial C300 Spinpoint F3 Caviar Black ASUS DVD-RW 
CoolingOSMonitorKeyboard
Arctic Cooling Freezer 7 Pro Windows 7 Home Premium 64-bit Samsung 23" Saitek Eclipse III 
PowerCaseMouse
Corsair 430W NZXT Source 210 Wolf King 
  hide details  
Reply
post #3 of 6
Thread Starter 
That is definitely something I would not have thought of. Thanks for the response and I'll give that a try.
post #4 of 6
Thread Starter 
I took out the mobo and looked around.. Nothing stood out, unfortunately. Obviously a short could be very tiny to a point that I wouldn't notice, but as of right now, I see no causes of short or any signs of burning.

I might try re-installing the board and trying again under the hope that there was indeed a short that was fixed when I took it out.

Thanks again for the reply.
post #5 of 6
run the board out of the case on some cardboard
post #6 of 6
Thread Starter 
So it's been a long time since looked at this thread. things got crazy at work and honestly had to put the computer on the back burners.

Update!

I took the cpu and memory out of my board and put them into my server to see if it would boot. I figured: if not, I'm right where I started; and if it does boot, then I get a cheap upgrade to my server. It worked! That eliminates all issues down to my motherboard. A couple people suggested baking.

I gave it a shot! 7 minutes at 350F. I didn't remove or cover a thing. Still had the back plate from my water block, all plastic, the heatsinks as well. I managed to get it propped on the bolts from the water block and used a ball of aluminum foil to hold the other end up. devil.gif

Nothing popped, nothing melted, not even the rubber gasket to the back plate. I'm letting it cool down now and I hope to test it either late tonight or tomorrow. I'm going to let it cool for a couple of hours. Hopefully, I didn't fry the chips under the heatsinks. XD

Worst case scenario, I lost an open box mobo and gained an upgrade for my server! If that's the case, I am going to try and score an Asus Maximus V with an i7 3770k during the holidays. Add 32GB of 1886MHz ram and life will be good thumb.gif
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: AMD - General
Overclock.net › Forums › AMD › AMD - General › Computer won't post after PSU replacement