A friend turned off her Dimension 2350 before going on a week's vacation.

Upon her return, the computer powers up (power light is green), but we can't seem to get any hard drive activity. I can hear it start up, but then it immediately quiets down -- as if going into hibernation. Her Dell monitor immediately reports "going into power-saving mode" or something similar. I tried a different monitor, but that didn't work either.

Diagnostic lights on the back suggest a memory module problem: A and B are yellow/amber, C and D are green. I have removed and re-seated both RAM chips, one at a time, in each slot, to no avail. Only thing that changed is when I kept both RAM chips out -- then the diagnosic lights let me know that no memory could be found.

Is it really possible, though, that both RAM chips failed at the same time, after she powered off? I would hate to buy chips if there are other things I should be looking into first.