I recently installed a new heat sink and fan. I had the stock one, and relplaced it with a zalman cnps7000 cu. the first time, the computer overheated i believe and restarted because i have overheating protection on my asus a7n8x deluxe mobo. I reinstalled the hsf with more thermal paste, and now its running at a cool 47 C compared to 80 C the first time i put it in. Now, when i chose linux or windows when i boot up, it will freeze. The hdd light doesnt blink and the only thing i can do is restart. I tried restsetting the bios defaults but that didnt work either.