IMac Freezing on Video Playback 21.5" Model

Hi,
I have only had my iMac for around 6 weeks and it has been in for repair for a replacement hard drive already as the other one was making a loud clicking noise.
Before it went in, I noticed that after the iMac had been on for a few hours, if I went to play a video say in AVI format, Quicktime / VLC would freeze, and if I went to play a flash video say on YouTube or iPlayer the Internet Browser would freeze. If I restarted the computer it would work again, but then only for a few hours.
My iMac has come back with a new hard drive, and all my stuff was on as it had been cloned, but the freezing still happened, I have wiped my drive to see if it was software based, and put everything back on clean, now it is freezing again!
Any ideas?

HI,
iPlayer on the site says it's compatible with 10.5 or later but that doesn't necessarily mean it's compatible with Snow Leopard 10.6. Delte iPlayer and see if it makes a difference.
and if I went to play a flash video say on YouTube
Uninstall then reintsall a new copy of the plugin.
Uninstall Flash
Install Flash
Then Repair Disk Permissions...
Quit any open applications/programs. Launch Disk Utility. (Applications/Utilities) Select MacintoshHD in the panel on the left, select the FirstAid tab. Click: Repair Disk Permissions. When it's finished from the Menu Bar, Quit Disk Utility and restart your Mac. If you see a long list of "messages" in the permissions window, it's ok. That can be ignored. As long as you see, "Permissions Repair Complete" when it's finished... you're done. Quit Disk Utility and restart your Mac.
Carolyn

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hey all
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HI,
iPlayer on the site says it's compatible with 10.5 or later but that doesn't necessarily mean it's compatible with Snow Leopard 10.6. Delte iPlayer and see if it makes a difference.
and if I went to play a flash video say on YouTube
Uninstall then reintsall a new copy of the plugin.
Uninstall Flash
Install Flash
Then Repair Disk Permissions...
Quit any open applications/programs. Launch Disk Utility. (Applications/Utilities) Select MacintoshHD in the panel on the left, select the FirstAid tab. Click: Repair Disk Permissions. When it's finished from the Menu Bar, Quit Disk Utility and restart your Mac. If you see a long list of "messages" in the permissions window, it's ok. That can be ignored. As long as you see, "Permissions Repair Complete" when it's finished... you're done. Quit Disk Utility and restart your Mac.
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