I bought a refurb Macbook (2.16 C2D, 2GB RAM) in January and have had no problems with it. It had a 120Gb HD until the weekend when I replaced it with a 250GB Western Digital drive (bought in April). I used Super Duper to make a bootable clone of the 120Gb drive onto the new 250Gb drive. After inserting the new drive into the Macbook it booted no problem. However since then I have had the following issue happen to me 5 times over the last 3 days. After using the Macbook I just close the lid and it goes to sleep. Going back to the machine and opening the lid it appears to wake up no problem. If I then try to do anything I get the spinning beach ball. After about 5 minutes with no response I power the machine down and restart - only to get the flashing question mark at boot up. The only way I have been able to boot successfully is to remove the hard drive, reinsert it, and then restart. However I don't want to keep on having to do that. Is my new hard drive faulty? About to fail? Or is it a problem with the Macbook itself? Any help gratefully received.