iMac Freeze Cools Mac Hearts

Apple's latest iMacs suffer from a graphics card problem that causes the computer screens to lock up.

Quality control problems once again, this time concerning Apple's latest iMacs, which seem to suffer from a graphics card problem that causes the computer screens to lock up.

Numerous discussion threads on Apple's support forums report that while the iMac display becomes unresponsive, the Mac itself appears to work normally, indicating the fault relates to the iMac's ATI Radeon HD card.