iMac 21 , OS 10.8 works very slow,
I have a computer iMac 21.5-inch, Mid 2010 , OS 10.8 works very slow, recovery over Time Machine (10.6) and a complete reinstall (10.8) does not help:
slow during the startup, even when i select OC
Bootcamp Windows 7 also not boot hangs at the entrance
What to do? I Checked the disc Macintosh HD via Disk Utility it says that the drive is OK and does not need to fix
what to do and how to find out what the problem is?