I am just switching over to P5VDC-MX with P4D 3.4 processor. I am using DDR1 512x2 ram. Because I am upgrading from a Siemens MB (3.0 ghz), i already had a working HDD with Win XP SP2 with all the updates. When I insert that HDD into the asus system... i don't hear any beaps when i turn on the system. I get the screen saying that windows could not load properly...gives me options to load safemode, with cmd, with net, last know config, and normal. I have tried them all but the same result... computer restarts and brings me back to the same screen. Safe mode loads drivers till mup.sys and then reboots.... I HAVE THE LATEST BIOS VERSION Thanks in advance.