Pc Powers On For 1 Sec. Then Shuts Off - Gigabyte P55-Ud4P, I5 750, Oc

[DylanFromCanada]

I can't get my motherboard to POST. I power on and the 4 PHASE LED light up (all 4) and the CPU & GPU fans start to spin for about 1 second and then it shuts off.

 

I've had the motherboard, CPU and RAM running for about 4 months. I recently upgraded the stock heatsink to Noctua NNH-U12P SE2, PSU to OCZ ModXStream Pro 700W ATX 20/24PIN, along with case Coolermaster Cm 690 II Advanced.

 

Gigabyte P55-UD4P (MB REV: 1.0, BIOS Ver F9)

Intel i5 750 2.67 GHz

G.SKILL Ripjaws F3-12800CL7D-4GBRH (2x2GB)

OCZ ModXStream Pro 700W ATX 20/24PIN

EVGA Nvidia 7800GT

Windows 7 Home Premium 64 Bit

 

I recently replaced stock heatsink with noctua so I cleaned CPU headspreader and reset with noctua using small amount of thermal paste, installed motherboard in new case along with OCZ 700W psu.

 

Everthing booted up fine with just the bare min. of attached devices, 2 640GB SATA2 hard drives running RAID 0.

 

Once it booted I checked temps and everything looked great 20-30 degrees celcius cooler than stock when running Prime95.

 

I then connected the rest of the harddrives (2 more 7200 RPM sata2, 1 OCZ SSD, 2 sata2 DVDRW drives, and the case fans.

 

Everything ran fine did the stress testing, temperatures were 30-40C.

 

I used the ASUS Quick Boost to bump the CPU to 3.0 Ghz ran stress test, then bumped it to the next step 3.8 Ghz and everything booted fine and tested ok.

 

I then moved the OC CPU back down to 3.0Ghz and re-enabled Turbo. The computer booted up and during a Prime95 stress test the computer powered off. Temps were about 55-60C when this happened. With stock heatsink and Turbo enabled temps would reach 70C.

 

I then tried booting again and the problem started. I was able to get the computer to boot a couple times by disconnected some of the extra hard drives and DVDRW drives. It eventually shutoff again and I haven't been able to get the motherboard to POST.

 

Here is what I've tried:

 

Disconnected and reset (GPU, CPU, RAM, power connectors)

Tried one stick of RAM

Cleared CMOS (jumper), removed battery

Removed M/B and ran outside case

Tested PSU (paperclip Green to Ground) It powered on

Tried my old PSU 550W, same result (doesn't have 8 pin CPU power conn.)

PC speaker connected (no sound, power on only lasts 1 second)

Looked for possible motherboard shorts or blown capacitors/transistors

 

Any ideas?

[Boinker]

Weak PSU......... Try unplugging everything except for the Bar min and get it to post.

[Miek]

Do you have another PC you could use to test individual components? Maybe something fried somehow.

[DylanFromCanada]

I've tried removing just about everything right down to just PSU, motherboard & CPU and PSU, motherboard, CPU, 1 stick of RAM.

 

Same result each time. Starts to power up 1 sec (maybe even less) fans start to spin and 1,2,3,4 PHASE LED lights turn on. 1 (Green), 2 (Green), 3 (Orange/Yellow), 4 (Red).

 

Do you have another PC you could use to test individual components? Maybe something fried somehow.

 

My other PC is an older AMD computer.

[joel.monteiro]

if u have cleared the cmos it doesnot look like its an OC prob.just check if uve matched all the pins of the cpu correctly.

[DylanFromCanada]

I believe I found the culprit, the Gigabyte P55-UD4P motherboard.

 

How did I come to this conclusion. The fizz sound followed by a puff of smoke was a hint.

 

I tried resetting CPU and switched on the power this time the motherboard didn't instantly shut off but I heard a fizz followed by smoke and that awful smell we all fear.

 

It was hard to see but it looks like 2 solder joints have become fused. It was on a chip under the heatpipe/heatsink that surrounds the CPU.

 

There are a bunch of these chips in direct contact with the motherboard heatsink/heatpipe. See photo below under the blue/white heatsink at the top of this photo.

 

 

Now it's time to check and see what Gigabytes warranty is on it's motherboards. I bought this about 3-4 months ago.

 

It the mean time I can't wait for a warranty replacement or repair because I'm sure these weeks or months to complete.

 

Any suggestions on a replacement 1156 motherboard for Intel i5? This was my first Gigabyte motherboard I've always been an ASUS guy.

[RogerDeath]

I believe I found the culprit, the Gigabyte P55-UD4P motherboard.

 

How did I come to this conclusion. The fizz sound followed by a puff of smoke was a hint.

 

I tried resetting CPU and switched on the power this time the motherboard didn't instantly shut off but I heard a fizz followed by smoke and that awful smell we all fear.

 

It was hard to see but it looks like 2 solder joints have become fused. It was on a chip under the heatpipe/heatsink that surrounds the CPU.

 

There are a bunch of these chips in direct contact with the motherboard heatsink/heatpipe. See photo below under the blue/white heatsink at the top of this photo.

 

http://images.highspeedbackbone.net/SKUimages/enhanced/G452-0100-call03-ro.jpg

 

Now it's time to check and see what Gigabytes warranty is on it's motherboards. I bought this about 3-4 months ago.

 

It the mean time I can't wait for a warranty replacement or repair because I'm sure these weeks or months to complete.

 

Any suggestions on a replacement 1156 motherboard for Intel i5? This was my first Gigabyte motherboard I've always been an ASUS guy.

If you show them a picture of what happened prior to your RMA there is a good chance that GB will take care of this quickly (took Biostar 1-2 weeks when I showed them the picture and GB has MUCH better Customer Service then Biostar). I wouldn't worry much about getting a new board under these circumstances, I certinally didn't and I was out one for ~1.5 months overall.

[ir_cow]

Weak PSU......... Try unplugging everything except for the Bar min and get it to post.

 

 

what kinda of response is that, hes using the same psu as i do and is drawing less power. maybe with the 500watt i could maaaybe see it with OC...

 

anyways that also sucks dude it ended up being the MB, i really like Gigabyte has been in every build until this newest one. either ASUS or Foxcon would be my next choices.

[wevsspot]

Hi, DylabfromCanada, having another similar computer for parts can simplify your troubleshooting. You have identical motherboards, compatible memory, and compatible CPU's.

Work through our standard checklist and troubleshooting thread:

[tomshardware.com/forum/ [...] t-problems]

He has already determined that the motherboard is faulty with a specific failure mode. He doesn't need to work through your "standard" checklist over at Tomshardware.com......................................

 

I mean can you proselytize any more blatantly?

[Nephilumos]

He has already determined that the motherboard is faulty with a specific failure mode. He doesn't need to work through your "standard" checklist over at Tomshardware.com......................................

 

I mean can you proselytize any more blatantly?

 

 

IT'S A BOT!