Ok - so I think I've been duped unfortunately. So, I buy a used Macbook on eBay (yeah, you know where this is going) The user listed it as "Flashing grey folder icon, I don't know much about computers so I'm selling it as is" So I think, great - he just has a dead HD, and doesn't want to bother fixing it. No big deal. So I buy the laptop, and the thing already has the HD removed upon opening it... great. I suppose I shouldn't have assumed that he DIDN'T open the laptop - so maybe that's stupidity on my part, whatever. Fingers crossed, I put in a new HD. So the problem is - I install a new HD, boot from CD, open disk utility - and low and behold, no HD detected. I'm fairly knowledgeable about the hardware - but not really enough to diagnose this visually if I were to open it. So what could be the issue here? Are there a multitude of things it could be - and I'll have to pay someone to check it out? or does it just generally mean I'm screwed? Everything else seems to work fine - I can boot into Linux using an external drive, it's just not detecting a HD.