First... apologies for another thread like this, but I don't want to mess things up! My father-in-law's hard drive has just failed and I said I'd see if I could fix it. Basically the screen is grey with the folder icon and question mark and it won't get past this screen. I have tried resetting PRAMS, re-seating RAM and have booted from OSX install discs and Diskwarrior 4.2 but neither of these programmes can even see the hard drive. Also the hard drive does that quiet BEEPING sound. So I have diagnosed hard drive failure? OK, so assuming I'm actually correct... Would this hard drive be OK to use? Western Digital Scorpio Blue 320GB SATA 8MB Cache 2.5 inch Internal Hard Drive If so great. I have found the DIY replacement instructions and it looks really easy to do - just unscrew a few screws and whip it out with the white tab. He did a time machine back up on a usb external drive on the 6th January so again I assume this is fairly easy to restore? I just boot the new hard drive from the install disc, install OSX and then restore from the install disc using the external hard drive back up? Sorry for all the questions, I'm just trying to save him some money in these economically disastrous times, without totally messing things up in the process.