Question about ASUS A8N32-SLI Deluxe Motherboard

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Motherboard problem motherboard cannot display when switch on, the cpu fan faster no beeping Hi folks! My ASUS A8N32-SLI Deluxe SOMETIMES doesn't POST / BOOT. No BEEP, no DISPLAY. It seems to be an HW issue, maybe something with MoBo and power management. When it happens, the RAM leds (a Corsair 3500LL PRO pair, 2Gb) are OFF; the only way I have to solve it is to leave the PSU unplugged for half an hour and then plug it again and turn everything on, then it posts/boots fine. Notice 1: sometimes I had the same problem in Windows; the system freezes without any (apparent) reason, expecially when idle; then RAM leds are OFF and it is quite impossible to reboot before having left the PSU cable unplugged for at least half an hour. Notice 2: no overclocking; I had this problem with both my old PSU (Tagan, 480W) and my new one (Corsair TX750W); my PC has also two GPU in SLI mode (Asus EN7800 GTX 512Mb). Strange and very frustrating. Any idea? Thank you in advance. Fabio Siciliano, Bollate (MI), ITALY (EU).

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Hi Fabio,

Nice system you have.

I would change the timings on your RAM in bios setup pages to a slower set of numbers, especially the last one in the timing from say 12 to 15. If that doesn't help, your cool RAM chips may be slightly defective if you purchased these as a Matched Set from Corsair. And were these RAM Chips in the approved list from Asus for your system board?

Corsair has lifetime warranty for their RAM so getting those replaced shouldn't be a problem.

What you want to do is download and burn a Bart PE bootup CD that has Mem Test 86 on it and run that test on your RAM to verify that the RAM may be defective. Corsair will want to know if you have run a RAM test on those chips.

So, try the slower timing settings, even though you are not overclocking them to start with.

Also, can you put each video card on a separate power rail instead of populating one power rail with both video cards?

Lastly, you stated that you can power off, leave the system off for a half hour and the system will boot. This, as you may know, indicates something is getting hot.This could be your Power Supply or your CPU. Have you used canned air to blow out the power supply and CPU fan and heat sink?

Regards,
Worldvet

Posted on Aug 23, 2008

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