at random times my computer will give a single beep and then completely lock up. it has happened at various time, at the windows xp logon menu, during bootup (while loading up GRUB(linux bootloader) and then afterwards while also loading windows), while being idle(no one was on the computer, i heard it beep, came to check itout and it was locked up) i dont think it is a hard drive issue as i have two hard drives and i have windows vista running on the second hd, and if i tell it to boot off the second hd, it will do the same thing. any ideas or suggestions? i have -msi motherboard a-md athlon 64 3000 -1 gig ram -geforce fx5200 video card w/128mb ram -2 hard drivers, 160gig and 300 gig; running various operating systems, but the problem seems to affect all the operating systems which makes me think tis some kind of hardware issue. im downloading sisoft sandra right now and see if i can run some diagnostic programs on it to test memory and whatnot, but besides that i cant think of any extra steps to take.