m_ahlenius:
Repair Disk
Insert Installer disk and Restart, holding down the "C" key until grey Apple appears.
Go to Installer menu (Panther and earlier) or Utilities menu (Tiger) and launch Disk Utility.
Select your HDD (manufacturer ID) in the left panel.
Select First Aid in the Main panel.
(Check S.M.A.R.T Status of HDD at the bottom of right panel, and report if it says anything but
Verified)
Click Repair Disk on the bottom right.
If DU reports disk does not need repairs quit DU and restart.
If DU reports errors Repair again and again until DU reports disk is repaired.
If DU reports errors it cannot repair you will need to use a utility like Tech Tool Pro or Disk Warrior
Reboot from internal HDD
Repair Disk Permissions
While booted from your internal HDD
Go to (Applications > Utilities > Disk Utility.
Select your HDD (manufacturer ID) in left column and First Aid in main column.
Click Repair Disk Permissions at bottom left.
Please post back with update or further questions/comments.
Good luck.
cornelius