PC fan whirl and screen freezes at Windows

[sage08]

hi,

My pc fan will sometimes give a loud whirl at startup and the screen will subsequently freezes after Windows is launched. This happens frequently but not always. I've ran defragment, fixed registry and checked the fan to no success. I'm at a loss as to how to fix this thing. Appreciate your advise.

[dcc]

Is this the case fan or the one on the CPU heat sink?

[sage08]

Is this the case fan or the one on the CPU heat sink?

It's the one at the system board, i suppose the CPU heat sink.. thks in advance.

[dcc]

If you can access the BIOS check the temperature of the CPU. If you don't know how to access the BIOS you could download Everest Home Edition , this is free.

It would also help if you provide the make and model of your computer.