I have a working ASUS P5LD2 Ver 1.0 with a Pentium D 805 processor. I picked up a refurb Pentium D 950 processor to upgrade but now pc wont boot & DVD rom is making a cluncking noise. I reinstalled the 805 and things are working perfectly.
Your 1st guess is correct, I still have bios ver 0603. Now getting the bios updated has been a real pain in the neck... I followed asus instructions which is to load bios installer AFUDOS v 2.32 and bios ver 1903 onto a thumb drive, then reboot with thumb drive installed, press F8 to select thumb drive and flash bios. Seems easy enough and I even watched a youtube video, but when I select the usb drive the system just hangs with a black screen?????