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I have this ASUS p7p55d-e pro for about 8 months(got it last July) and for this last 3-4 days I cannot boot without clearing my CMOS.

What I have is:

Seasonic M12D 750W  
ASUS P7P55D-E Pro  
Intel Core i5 760 Quad Core Processor Lynnfield LGA1156  
XFX GeForce® 8800 GT Alpha Dog 512 MB DDR3 Standard (PV-T88P-YDF4)  
2x Corsair XMS3 CMX4GX3M2A1600C7 4 GB DDR3 2X2 GB DDR3-1600 CL 7-8-7-20

I tried to remove all the unnecessary stuff: HD/DVD/pci card/USB cable/etc I tried with only 1 dimm filled, instead of my 4, each one individually. It didn't work.

I tried changing the battery, here goes a few dollars to nowhere, didn't work.

If I don't reset the CMOS it sometime stock on RAM led, sometime on BOOT DEVICE led, when this happen, it stuck on CPU speed detection.

When I boot right after the reset, I MUST click on the F2 option (boot with default BIOS setting) if I go into the BIOS and save/restart, I have to reset it again When booted, everything is rock solid stable, tried memtest, CPU stress, etc, etc. Without issues.

What should be my next step? Trying a new PSU? (I need to find one.) Do RMA? (I need this mb since it's my only computer...)

Something else?

Edit: I just tried with a new PSU, it didn't fix the issue.

Tamara Wijsman
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Fredou
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6 Answers6

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I have the same problem. I have an Asus P7P55D-PRO, it has been having boot problems for the last 6 months. The green standby LED is delayed after switching on the PSU. Then when I press the power button the computer starts only for 1/4 seconds. I've fixed it by clearing the CMOS settings on every boot, the computer starts automatically when the standby LED is on.

Indrek
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manu3193
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If the CPU is overclocked (running faster than it's rated for), this could be one cause. A failed CPU fan could also be a problem because your processor could be running too hot.

Randolf Richardson
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The one DIMM you tried might be the bad one.

Bad RAM can give boot problems, and if the parts that are bad are used in the boot process, they can escape testing.

Try swapping your RAM positions and running memtest86+.

kmarsh
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Are you cutting power to the computer when it's turned off?

I've had this problem with some Asus settings when computer is unplugged. BIOS thinks that it was because of bad overclock and settings need to be reset.

AndrejaKo
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Have you considered that you might have a BIOS rootkit? Clearing the CMOS & restoring default settings overwrites the rootkit, but only temporarily, since the trojan somewhere in your system (CD/DVD player memory chip?) reloads the corrupt BIOS after that, which prevents next boot.

Maddy
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And along with all these good ideas be sure your mobo battery is in good condition. A failing battery can cause odd conditions that are hard to diagnose.

thisfeller
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