Booting from OSX disk - no drives available to install to

I recently partitioned my Macbook so I could install a version of Linux. Although I got it to run and even switched back to using OSX afterward, the next time I restarted the machine wouldn't boot. I get a blinking folder icon with a question mark. I tried everything on the Apple support page regarding this problem but nothing worked. After repairing the drive it said that everything was ok and it won't allow me to even choose the drive to install OSX to. The HDD, Bootcamp and unnamed partition are all marked with exclamation points and say they are not available to install OSX on.

I feel like I've exhausted my Google search capabilities on this so before I take it to Apple, does anyone have any advice? I'm also going to try GParted to see if I can remove that unnamed partition. I don't think it's a hardware problem.

Thanks!

 

I actually finally figured it out. I had to erase my entire hard drive and re-partition it as GUID partition table which enabled the OSX installation to the drive. I lost everything but thank goodness I decided to do a time machine backup to my external for the first time ever a few weeks ago...didn't lose anything important.

Anyway, looks like I'm back in business. Though I'm not gonna be messing around with advanced partition settings until I'm a bit more savvy.