CMOS reset won't hold

[harrillj]

Hello,

Just built a PC with a Asus p5k Deluxe mobo and an intel core dual 6600, 4 GB of ram. I was in set-up today to change the boot sequence and may have screwed something up. When I power up, the power starts up for about 5 seconds, the fans start including the processor fan, the LEDs all come on, and after about 5 seconds, power goes off for about a second, then powers right back on and the LEDs all start up, and the fans are all on including the CPU fan.

However, my monitor is black, expect the monitor power led is on.

I have been working this for 6 hours now and spent some time on the Asus site. I found that resetting the CMOS by removing the battery, temp changing jumpers, then put the battery back is a step Asus recommends. I did that and when I powered up, this time PC did power up, did not shut down after 5 seconds, in other words, all powered up except I had to reset the system clock.

Then, when I do a normal shutdown, it takes me back to the initial problem. Each shut down requires thre CMOS clear just to be able to boot up again

Any help would be appreciated.

 

[hardbench]

Try a new CMOS battery, usually a CR2032A I believe... Otherwise, board may be toast or need a new bios chip. Maybe try reflashing the bios.

 

[TC10284]

Try a new CMOS battery - if no luck there, you can try flashing with the latest BIOS from the mobo manufacturer

 

[Rebel44]

Are you sure your PC is disconected from power? - I experienced this once and after few minutes of thinking WTF... I noticed that I didnt disconect power - turned off everything removed battery and problem was resolved.

 

[holtt]

harrillj, I am having the EXACT same problem with my P5K Deluxe. Any word on how you were able to resolve this or did you at all?

The one thing I noticed odd is that I do get the beep code for no RAM if I remove my memory, but if I remove the video card I don't get any "no video" beep code.

 

[holtt]

Success! I went and bought a stick of Kingston "cheap" RAM (DDR2, 667, 1G) and IT BOOTS! So this thing it seems is very sensitive to what kind of RAM you give it - ironic that it's the cheap stuff that did the trick :^)

 

[Cutthroat]

Originally posted by: holtt
Success! I went and bought a stick of Kingston "cheap" RAM (DDR2, 667, 1G) and IT BOOTS! So this thing it seems is very sensitive to what kind of RAM you give it - ironic that it's the cheap stuff that did the trick :^)

Probably because the cheap RAM has a spec voltage of 1.8v while a lot of high quality RAM has a spec voltage of 1.9-2.1v. The board likely defaults the RAM voltage to 1.8v.

Try setting the RAM voltage to 2.0v in your BIOS (or whatever the manufacturer specifies), then shut down, unplug, change the RAM to the high quality stuff and reboot.

P.S. You may also have to manually set the timing of your RAM. And there are some new options in the P5K BIOS jumperfree menu that you should look into. I have managed a higher and more stable OC with this board than I did on my P5N32-E SLI due to these new settings.

Also, flash your BIOS to 0404.