PC Randomly Reboots even in Bios

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Cbl12886

Limp Gawd
Joined
Jan 7, 2007
Messages
357
The past couple months I have had problems with my video card crashing but then recovering. It was a problem with the drivers so I reverted back to a previous version and this fixed the problem. Then my computer started randomly rebooting and I swapped out the graphics card and this kept happening. Now my computer won’t boot to Windows and always shows the system repair screen where you can repair or boot to windows. If I repair it does not find any issues and when trying to boot into windows I see the “Starting Windows” screen but then it reboots. I have had it reboot when trying to repair and even in the bios. I was able to run a memory test from the bios and with windows disk and it was fine. I think it could either be the Motherboard or Power Supply but I am leaning more towards the mobo after reading some of the newegg reviews. I do not have any spare power supplies or motherboards to test. Any suggestions on how to troubleshoot this issue? I think I am going to pick up a power supply tester on my way home from work.

Parts:
Thermaltake V3
i5-2500k
MSI P67A-G43
8GB Corsair
MSI GTX460
Samsung SpinPoint 1TB
Crucial M4 64GB SSD
 
Are you overclocking? I've experienced this random reboot at the "Starting Windows" as well. This usually happens if a piece of hardware was swapped out and somehow it resets the CMOS? I don't know 100% sure, but check you CPU/DRAM settings and make sure they're what you normally have them set to. When I FIRST got my setup (Crosshair IV Forumla / X6 1090T) and got my new computer all plugged up, it would default the CPU to some crazy OC settings like 4.4ghz and 6-6-6-18 RAM timings, was the weirdest thing. It also could be a USB external hard drive plugged in while booting. If mine is plugged in, for some reason it takes ages for it to pass the BIOS screen.

tl;dr = Check OC settings for CPU / Memory timings to ensure they're what you previously have them set to or try setting them to default settings and see if that at least gets you into Windows and go from there. Good luck!
 
I switched the bios settings back to the "Optimized Default" option but i'll double check the settings when I get home. I can try resetting the cmos as well.
 
Any chance that you can swap out the RAM? I'm not entirely convinced the RAM isn't the culprit.

Though, what PSU do you have?
 
Danny Bui - Unfortunately I don't have any other DDR3 ram to test. The power supply is an Antec Neo Eco 620w.

Tonight I tested the power supply with one of those PSU testers and it was fine. After removing the power supply, I also removed and inspected the motherboard and it seemed fine as well. I cleared the cmos to see if it was an issue with the bios. None of that did anything. When it gets to the "Starting Windows" screen it flashes a bsod for half second and immediately reboots. I did not notice any random reboots this time but I never had it on for too long. Tomorrow I am going to use hd tune to test the SSD but it seems like it could only be the Ram like Danny said or mobo. Any other suggestions would be great.
 
Test the hard drives and GPU as well. The stickied "Basic Troubleshooting Guide" has a bunch of links on some other hardware tests that you can perform.
 
Thanks for the help Danny. I'll let you know how it goes tonight. I also need to check the rams sticks independently since I never tried that.
 
SSD HD Tune Error Check
SSDErrorCheck.PNG
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Now I am going to run memtest with the Ultimate Bood CD.
 
Well I was able to get it to boot to Windows. I switched from IDE to AHCI mode in the bios. This still does not explain the initial random reboots so I am still going to run more tests.
 
ryan_975 said:
0x7B is an inaccessible boot device error. What revision is your chipset? If it's B2, Intel had to recall them due to a flaw in the SATA-3g controller.
Click to expand...

It is a B3 board. I wonder if the random shut downs might have messed up the bios. I know I had it set to AHCI when I first built the computer and the BSOD started before I cleared the CMOS.
 
If the issue's persist, increase memory voltage just a touch over 1.5v (no more then 1.57)

If the issue persist after that, swap out the video card. I had very similar problems with my 460's in the same mobo, worked fine for awhile (initially) then it just went south from there.

Matter of fact, I had a very similar setup as your rig except for Evga 460's and Corsair TX750 psu and the Thermaltake v6 case (rest was the same)
 
Memtest86+ came back fine. I guess i'll just have to keep using the computer and see if the random reboots keep happening.
 
The computer is still random rebooting without a bsod like it is losing power. Any ideas on how I can pin point the issue???

So far I have tested the ram with memtest, ssd with hd tune, and the power supply with one of those psu testers and all came back fine. I need to figure this out!
 
Unfortunately those PSU testers aren't conclusive at all when it comes to determining whether or not the PSU is faulty. Your best bet would be to use a digital multi-meter if you want a more accurate assessment of the PSU.

Do you have any spare hard drives, DVD drives, or video cards? Also, what RAM do you have?
 
Cbl12886 said:
The computer is still random rebooting without a bsod like it is losing power. Any ideas on how I can pin point the issue???

So far I have tested the ram with memtest, ssd with hd tune, and the power supply with one of those psu testers and all came back fine. I need to figure this out!
Click to expand...

Actually, I concur with Danny about those PSU testers: They only tell you which line (or rail) is completely dead. They will not tell you whatsoever whether a given line is in spec or way out of spec.
 
A lot of things can make a PC reboot even in BIOs. Hence why I try to rule out every single part if there's a reboot during BIOs.
 
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