Hi, I purchased a refurbished macbook a few weeks ago and have had nothing but problems with it. It started have kernel panics and startup problems as soon as I got it. I took it to the Apple store and they said the hard drive needed to be replaced so that's what they did. It is still crashing and having kernel panics and I've taken it back 2 more times and they can't find anything wrong with it. Of course as soon as I take home again it starts acting up. I'm hoping someone here has an idea what is going on so I can suggest the problem to them next time I take it in. I leave it on the charger all day long with the lid closed. When I get home I open it up, it wakes up and a few seconds later has a kernel panic and tells me to restart. I restart it and it gets to the grey screen and just starts beeping loudly over and over again. It will do this every time I try to restart it. Of course as soon as I bring it in to the store it starts right up again I have no idea what to do but I feel like throwing the thing out the window because every trip back to the store is a 3 hour ordeal. Please help!!