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Home Server Poweroff during Reboot?

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July 11, 2012 9:07:27 PM

I recently build a home server using the following components:

PSU: CORSAIR Builder Series CX430 V2 (CMPSU-430CXV2): http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Motherboard: BIOSTAR B75MU3+ LGA 1155 Intel B75: http://www.newegg.com/Product/Product.aspx?Item=N82E168...

CPU: Intel Pentium G620: http://www.newegg.com/Product/Product.aspx?Item=N82E168...

RAM: G.SKILL Sniper 8GB (2 x 4GB) 240-Pin DDR3: http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I'm running Ubuntu on the server and have 3x3TB HDD's in a Raid-Z pool that are working great. I also have an 80 gig system drive working great as well.

The problem I've run into, is that sometimes, when I reboot the system, it shutsdown properly and actually begins the boot, but after giving 1 beep from the BIOS (signifying successful POST) and seeing the BIOS splash screen, it will just instantly kill power and shutoff. It seems to do this after successful POST, but before beginning to boot the OS. Also, it doesn't do this everytime, just randomly during reboots. It has never happend during a normal startup (from the poweroff state). Is there any way to troubleshoot this problem?
July 13, 2012 1:06:09 AM

Honestly, I don't think I need to do this test as my computer works. Power supply fan spins and computer will run for hours with no problems. It has never had a problem booting from a power off state, but only randomly has problems during reboots. I just did 5 reboots in a row and it worked perfectly, but number 6 failed right after the 1 beep for successful post and the power just shut off.

It's a brand new PSU, that "works", so if the PSU is really the problem here, could someone explain better exactly what is wrong with it?

Another note that I'm not sure about, is that it failed a few reboots just after starting it up, but if I left it running for an hour or so, then rebooted, it was successful multiple times. Is there any chance that my computer needs to "warm up" before it can reboot properly? If so, is this an indication of a PSU problem?
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July 13, 2012 1:31:36 AM

One further note, is that when the computer shuts itself off during the reboot, the numlock light remains illuminated on the keyboard. I've tried pressing keys to wake the computer with no luck.
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August 10, 2012 9:55:44 PM

I wanted to update this thread because it has been so frustrating. I RMA'd my brand new corsair PSU and recieved the new one. Well, guess what, the new one does the exact same thing. Strangely my old junky PSU works perfectly. I'm going to fight for my money back from Corsair.
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a b B Homebuilt system
August 11, 2012 4:39:02 AM

no wait it could actually be a mobo issue... in your hadbook there should be a beep code dont get your money back just quite yet
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August 12, 2012 8:51:20 PM

I don't believe it's a motherboard issue, because the problem does not exist while I am using my old junky PSU. There is only 1 beep at startup, and that signifies a successful POST.

PanicMaster85 said:
no wait it could actually be a mobo issue... in your hadbook there should be a beep code dont get your money back just quite yet

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a b B Homebuilt system
August 14, 2012 6:21:36 PM

oh ok i guess i never saw that... hmm just two faulty in a row does not sound likely at ALL
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a b B Homebuilt system
August 14, 2012 9:40:19 PM

PanicMaster85 said:
oh ok i guess i never saw that... hmm just two faulty in a row does not sound likely at ALL
If the old PSU works fine, then it could be an incompatibility issue between the PSU and the motherboard.
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a b B Homebuilt system
August 15, 2012 1:28:42 AM

it could be i have never seen that before but it is possible
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a b B Homebuilt system
August 15, 2012 1:31:48 AM

I've had a very similar issue several years ago.
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August 16, 2012 3:36:56 AM

GhislainG said:
I've had a very similar issue several years ago.


Well I've been wrong before, but I just had the reboot fail with the old PSU that I thought was immune to the problem. That makes 3 PSU's (2 corsair CX430's and one old Raidmax) that all exhibit the same problem. I'm now pointing my finger at the Biostar motherboard. I'll be contacting them about the problem soon. What a pain this is to troubleshoot.
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a b B Homebuilt system
August 16, 2012 4:56:05 PM

yep i thought it was the mobo... atleast we ruled out the psu factor... and yep troubleshooting is a bitch when you dont get it right the first time.
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October 13, 2012 5:32:57 AM

I think I finally solved this problem. My Motherboard was setting my RAM timings too tight. It was automatically set to 7 7 7 20 when my RAM is only rated for 9 9 9 24. In the RAM info in BIOS is even shows that it's supposed to be 9 9 9 24, but continues to automatically set it to 7 7 7 20. I manually set all the RAM parameters and now I have no failed reboot problems.

I will never buy a Biostar motherboard again. I'm sticking with ASUS and Gigabyte from now on.
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