Be exctremely carefull if you plan on overclocking. Done wrong or to agressively, it can destroy the CPU, BIOS or memory.
There are no particuliar precautions if it's to install and recognise a new hard drive.
Electro
January 2012
Ther are a range of bios manufacturers most use either "del" or "f2" on power up. Beware what settings you alter ie bus speed as this could damage the pc
MR CHIPS
January 2012
Not sure on your model but it is usually either the Delete key or F2
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix desktop pcs.