I bought an Atlhon XP probably back in March. It came with a Maxtor 7,200 RPM hard drive. It has a 128MB NVidia Ti4600 graphics card. An ASUS A7V266-E mother board. The case is an Enlight 7237 with a 400 watt power supply. The heat sink fan for my processor is a Cooler Master 5400 RPM fan with a copper base. Sorry I don't remeber the model number. Two cd drives, and a floppy drive. 256 MB of 2100 DDR RAM. Anyways the computer worked fine till awhile back after I decided to take the hard drive out of my old computer and put it in my new computer. It's also a Maxtor 7,200 RPM hard drive. After a couple weeks of having both hard drives in my computer my processor kept over heating. The processor will get up to about 89 degrees celsius. I thought adding a second case fan would remedy this problem since I only have only case fan installed right now. It's the case fan that came with the case. I talked to a guy today at a computer parts store , and he told me that he didn't think the second case fan would help that much. He said that he thought that either rmy heat sink fan wasn't working or it wasn't making proper contact with my processor. He said either that or the heat sink fan wasn't powerful enough. I am pretty sure the heat sink fan is working okay I had already look at that when my computer started overheating. It seems like it's running fine. He told me adding the second hard drive probably wasn't part of the problem. I just need your guys advice on what I should do. I have no experience at trying to cool these puppies down. I don't have my computer over clocked or anything like that. Any advice on what to buy or do would really be helpful. Sorry if I wrote too much about my computer I just wanted to be as detailed as possible. Thanks guys.