Hi, first post on here, so I hope I'm in the right area! Some spec first-homebuilt PC, AMD Athlon 2600 processor (333fsb), Gigabyte 7VT600-P-RZ motherboard, 768mb RAM, 400GB HDD space (s x 120GB internal, a x160GB external) ATI Radeon 64mb graphics card, on board sound, x2 DVD writers, no floppy disc, DVB-S and DVB-T pci tuner cards, 4 port USB 2.0 pci card, 550 watt Sweex psu. Think that just about covers it! I was running on an ASROCK motherboard until recently- on that board, cpu ran very cool (around 40-43C on idle/slight load), but on this board, with the same cooling fan, according to MBM 5 it's running at around 57-59C-and that is with the side off the computer!! The main problem is, I use this PC to do a fair amount of video editing, and I'm finding that the PC is freezing whenever I try to process a video file. I've even noticed it when playing back a DVD on a few occasions. Right now, i'm playing a CD and typing this-cpu is 58C and case temp is 42C I've checked everything is in place- I used thermal grease when I put the cpu/fan back in place, so I don't quite understand why this is happening. Anyone any ideas??