Hi guys, was wondering if anyone can help me here.. I currently have Mavericks installed on my 2008 Penryn MBP, which has had the logic board replaced, and a Sandisk SSD placed last year. The computer had been running well, until I was stuck on the loading screen a month ago and couldn't boot up at all. I took it to the apple store, they ran their diagnostics and found that my HD was "unrepairable" via disk utility, so I had to wipe the whole drive, and they re-installed Mavericks for me. Since then I started having problems with booting up and wifi, which I never had before. My Wifi problems are pretty common for Mavericks I think. Usually if my computer is waking from sleep, most of the time the Wifi is disconnected, and when trying to click on the icon it either freezes or does nothing. Sometimes it shows the exclamation mark in place of the wifi icon. I can use other apps on my computer but can't get on the internet. Then, when I reset the computer, I usually get stuck on the loading screen. I usually have to boot into recovery mode (sometimes I get thru, sometimes I don't), then just manually restart again and it boots up. When I Do make it into safe mode, when I run the disk utility it says my disk is fine. I also noticed recently even when I am able to start the machine, I don't have the startup chime anymore. Anyone have any idea whats going on? Its super frustrating, and would appreciate any help you guys can give me. Thanks in advance.