Just couple days ago my 2009 Macbook unibody crashed with a screen popping up to reboot by pressing and holding the power botton. I never seen this screen pop up before since I had owned this Macbook for over four years now. After that incident, every reboot takes five minutes with the screen showing a status bar. But after it's booted up, everything is fine except the sound and Quicktime player doesn't work. Also while I'm just surfing the web, I noticed the laptop gets a lot hotter than usual also. I did some searches on online and did a self diagnostic test by rebooting and holding onto the "D" botton. This came up: "4MEM/4/40000000: 0xaa00de98" I'm still running OS 10.6.8. I wasn't sure if this was a software operating issue or not so I tried downloading Maverick from the App Store but it failed to download every time. Any help appreciated. Thanks.