I turned my desktop off last night without anything being abnormal. Came back to it this morning and nothing. The only sign of life was that the fans fired up at reduced speed i.e. noise off (default is full speed - a feature of my Asus P5W DH Deluxe). There was absolutely no signal to either the monitor or my TV. I went through the usual checks - leads, using a multimeter to check for voltage, swapping GPU slots and I got nothing. I then decided to try my Hardisk (Western Digital Sata3, 320Gb, 16Mb WD3200KS), GPU (Sapphire X1950GT) and Memory (OCZ DDR2 PC2-6400 Gold GX XTC Rev 2) on my mates computer and at least try to do some elimination on his Motherboard. I tested the HD first, no problem. I then did my HD and GPU together, and again, no problem. I then put in my memory and that is when his computer(my few parts) went nutty. The computer simple failed to respond maybe some slight glitches from the fans but nothing else. Nearly did a woopsy when I put his memory back in and it fired up and shut down a few seconds later. Uh oh. When I put my friends computer back together it was fine. Heart attack over. So, it would seem that the memory is to blame. First of all I need clarification that it is not a compatibility issue with my mate's M/Board an ASRock P55 pro/usb3. If that is not a problem then I presume that by a process of elimination it must be my RAM. Are the symptoms typical of RAM gone bad? Do they go bad like this? Of course, I've not tested my M/Board or PSU but at the moment my RAM seems the likely suspect. Any help much appreciated, Tom.