Computer fails to boot during post

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Rsimmons1127

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Sep 14, 2014
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I am all of a sudden having an issue with my computer turning off during boot. It will turn off, and then immediately reboot automatically and successfully the second time. Everything works as normal after that but after about an hour or so the computer shuts off by itself again without rebooting automatically. Not sure where to go from here...

Other info -
- Once it actually boots, the CPU temperature is around 65°C (max operating temp in specs is about 74°C)
- I don't have a chassis speaker so I cannot hear what the post beeps are but during post, when it gets to the CPU LED, The LED starts to light and that is when it fails and turns off. The second time through it runs through the same post sequence but that LED doesn't ever light and the computer boots normally

I have tried disconnecting everything except for the CPU from the motherboard and reseating everything but that didn't help. Any advice on where to go from here?

System info:
- OS: Win7 Pro
- Motherboard: Asus P8P67evo
- CPU: Intel i7 2600k
- PSU: RaidMax RX-850AE
- GPU: (2) GeForce GTX 550 Ti
- Memory: 16GB (4x4GB) Corsair Vengeance 1600MHz
 
Solution
JeckeL
That's a pretty low-end quality power supply... Whenever a reboot occurs (not during post, but after the computer has been running for a while) make note of the exact time of day. Once you restart, open event viewer and look at windows logs > system. If you see "Event ID 41 - Power Kernel, the system has rebooted without cleanly shutting down...." then it's almost certainly the power supply. How long have you had this PC?
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cin19

cin19

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Mar 14, 2011
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If the PC reboot randomly and repeatedly, and it maybe the PSU problem, even the PSU looks good on the review. http://www.gogaminggiant.com/2012/03/28/raidmax-850w-gold-power-supply-review/

You can just use the on board intel HD3000 or only one gtx550ti, if the PC works find then the chance is you need get the new PSU.

Or try the " Bench it - Troubleshooting " http://www.tomshardware.com/faq/id-1753671/bench-troubleshooting.html

If you buy the new PSU, make sure check here for the PSU tier list. http://www.tomshardware.com/answers/id-1804779/power-supply-unit-tier-list.html
 
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JeckeL

JeckeL

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Jul 19, 2009
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That's a pretty low-end quality power supply... Whenever a reboot occurs (not during post, but after the computer has been running for a while) make note of the exact time of day. Once you restart, open event viewer and look at windows logs > system. If you see "Event ID 41 - Power Kernel, the system has rebooted without cleanly shutting down...." then it's almost certainly the power supply. How long have you had this PC?
 
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Solution
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Rsimmons1127

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Sep 14, 2014
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Thanks for the responses. I have had the computer for about 3 or 4 years now. I'm going to swap the power supply with the one in my wife's computer (hers is similar) and see if that fixes it. If so, I'll have to just replace it.

If thats not the problem, could it be the CPU? Does 65°C seem hot for idle?
 
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JeckeL

JeckeL

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For idle temps that is SLIGHTLY high but not on the verge of damaging itself or anything. Are you using fans or do you have liquid cooling somewhere in your system? If it turns out your power supply isn't supplying power to everything properly that might affect the fans as well... can you verify that they're all running properly? If you have a CPU fan/heatsink make sure it isn't clogged with dust that basically nullifies the air flow
 
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D

Darthutos

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Sep 15, 2014
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Hi,

You can also try replacing your CMOS battery. It's the circle silver thing on your mobo. Probably between the cpu and the gpu.
Are you running any kind of Overclock? If so, try run stock.
Also try flash your Bios.
I have to agree, the 65 degrees celsius, I assume it's during idle, is bad. Are you on stock fans? Even so, without OC, you shouldn't have that kind of temperature. Reseat your HSF and Check your thermal paste.
 
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Rsimmons1127

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Sep 14, 2014
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So I was able to try a different power supply and it booted perfectly. I guess that means I'll be buying a new one. Thanks for all the advice. I noticed that it didn't affect the CPU temp though. I have 7 fans, not including the CPU fan, and all are running properly. I have 4 intake (2 side, 2 front) and 3 output (1 top-rear, 2 top). PSU is bottom mounted with fan down.

I think I will look at getting better fans and maybe re seating the heatsink to see if that changes anything.I'm just happy to have solved the PSU issue. Thanks again
 
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