Q: Freezing and Rainbow Wheel after watching videos.

How large is your hard drive and how much hard drive space do you have left?

Disconnect all peripherals from your computer.

Boot from your install disc & run Repair Disk from the utility menu. To use the Install Mac OS X disc, insert the disc, and restart your computer while holding down the C key as it starts up.

Select your language.

Once on the desktop, select Utility in the menu bar.

Select Disk Utility.

Select the disk or volume in the list of disks and volumes, and then click First Aid.

Click Repair Disk.

Restart your computer when done.

Repair permissions after you reach the desktop-http://support.apple.com/kb/HT2963 and restart your computer.

Troubleshoot the spinning beach ball

You need to free up some hard drive space.  Rule of thumb: You should never let your hard drive get to where you have only 10-15% of space left.

Seven ways to free up drive space

Where did my  Disk Space  go?

Slimming your hard drive

OmniDiskSweeper is a free utility that checks HD space.

FreeSpace cost $1 or is a free utility that checks HD space.

SpaceControl is a free utility that checks HD space.

FreeSpace cost $.99 - FreeSpace shows you how much space is available on all local, connected, and network drives with a single click.