Motherboard,RAM or Harddrive
 

I run a 2.6 ghz celeron,2 gig memory,400 gig harddrive,windows xp home The problem I am having is there are timme my pc will sound like the harddrive rocker arms crashing and it will freeze the pc. I have replaced the harddrive twice now and it does the same thing. I am wondering if this could be...