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Question now also on SuperUser for those interested in following up there.

[SOLUTION] - Turns out this was a BIOS related issue and upgrading to the latest ASUS BIOS removed all random behavior. Hope this helps someone.

I've recently noticed a rather peculiar problem cropping up in my ASUS P8Z68 Deluxe mobo, which I'll describe below.

First a bit of background...
About 3 weeks ago, when cold booting, the computer would constantly reboot itself in the space of 2-3 seconds - no boot screen, no display, nothing & scared the cr*p out of me. After checking all the connections doing a bit of sleuthing I figured it might be the CMOS battery** so I went out and got a new one, popped it in, hit the CMOS reset button at the back of the MOBO and that seemed to solve the problem initially. However, what I noticed was that while reboots from Windows/Linux were working correctly, the computer still went into infinite boot loop when doing a cold boot.

**The replaced CMOS battery is a standard Panasonic 3V CR-2032.
Before I replaced the battery with the Panasonic 2032, I would always lose the BIOS config, so replacing the batter with Panasonic actually did fix something, though not all the way.

Now onto the real problem, here's what happens during a cold boot -
1. Press the power button, computer starts up, a red LED near the bottom of the CPU socket lights up and it just stops right there with no further activity Q-LED display shows 59 and the LED is still lit up.
2. Pressing the hardware reset key does nothing to reset the computer, so its totally hung up.
3. Have to hold down the chassis power key for 5 odd seconds till the computer turns completely off
4. Then wait for another 5-10 seconds for good measure, and hit the chassis power button again, this time the computer starts up, and proceeds a little further until it hits the BIOS boot screen where it says
Code:
Overclocking Failed press F1
(note that at this point I have not overclocked anything and the CPU and RAM are running at stock frequencies).
5. So I hit 'F1' and proceed to enter the BIOS, where all I literally do is 'save settings and exit', literally nothing else
6. From this point onwards, the computer boots correctly into whatever OS I choose (either Windows or Linux)
7. I can use the computer just as if nothing is the matter, even reboot and go from one OS into the other, even enter and emerge from 'sleep' mode just so long as I don't shutdown completely.
8. The moment I shutdown power completely and try to start the computer again (begin from cold boot), I am essentially back at step 1. above

Can anyone explain what is going on here and how I might be able to fix this?
Edited by l33tfr4gg3r - 9/7/12 at 8:49pm
Beast
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7-2600K ASUS P8Z68 Deluxe ASUS GTX580/DC2/2DIS/1536MDS Corsair Vengeance LP 16GB @1.6GHz 
Hard DriveOptical DriveOSMonitor
1.5 TB combined External USB slimline Windows 7 Ultimate x64 Samsung SyncMaster 22.5" 
KeyboardPowerCaseMouse
Logitech G15 Antec Eartwatts EA-750 Corsair Obsidian 800D Intellimouse Sidewinder X5 
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Beast
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7-2600K ASUS P8Z68 Deluxe ASUS GTX580/DC2/2DIS/1536MDS Corsair Vengeance LP 16GB @1.6GHz 
Hard DriveOptical DriveOSMonitor
1.5 TB combined External USB slimline Windows 7 Ultimate x64 Samsung SyncMaster 22.5" 
KeyboardPowerCaseMouse
Logitech G15 Antec Eartwatts EA-750 Corsair Obsidian 800D Intellimouse Sidewinder X5 
  hide details  
Reply