First iMac Problem - Frozen on Wake from Sleep

[Tonerl]

I received my iMac at the end of last December and it has worked flawlessly ever since.

This morning, however, when I tried to wake my iMac from sleep. the mouse cursor wouldn't move; so, I turned it off and, after a delay, on again. This time, I reset the PRAM. Boot up was achingly slow, taking several minutes. Eventually, I was able to log in and all seems well so far.

I have repaired permissions on 'Macintosh HD' just in case.

Constructive comments and advice would be very welcome. (I have a bootable copy of system and data made with SuperDuper! should I need it.)

TIA

 

[Anaxarxes]

I received my iMac at the end of last December and it has worked flawlessly ever since.

This morning, however, when I tried to wake my iMac from sleep. the mouse cursor wouldn't move; so, I turned it off and, after a delay, on again. This time, I reset the PRAM. Boot up was achingly slow, taking several minutes. Eventually, I was able to log in and all seems well so far.

I have repaired permissions on 'Macintosh HD' just in case.

Constructive comments and advice would be very welcome. (I have a bootable copy of system and data made with SuperDuper! should I need it.)

TIA

That could be of these many things:

Overheating hardware component
RAM gone bad
HDD gone bad

I would give a call to Apple Care or bring it to an Apple store.