Imac, 2006, 2 GHZ intel, core 2 duo, 10.7.5   lockup

I am at wits end......for last year had in to computer repair several times...he put in new hard disk even and still locks up on use.....i totally erased everything and started over with clean install and it still does so I guess not a software problem.....sometimes I can run in safe boot but that does not allow me to do the work I need to do......Is there anyone out there that can help me?   I cannot define the certain time that it freezes but seem to be when I ask it to do something?

Click your Apple menu  top left in your screen. From the drop down menu click About This Mac > More Info > Storage
Make sure there's at least 15% free disk space.
Checked the startup disk lately?
Launch Disk Utility located in HD > Applications > Utilities
Select the startup disk on the left then select the First Aid tab.
Click:  Verify Disk  (not Verify Disk Permissions)
If the disk needs repairing, restart your Mac while holding down the Command + R keys. From there you can access the built in utilities in OS X Recovery to repair the startup disk.
FYI:   OS X Recovery requires a high speed broadband connection.
Backup all your important files before repairing or restoring OS X just in case.

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