iMac freezes after startup - any bright clues?

[applemacmac]

HI -

This is my first Mac user problem posting going back to my original SE!

Power PC based imac running leopard 10.5.8 starts up but then mouse freezes after a few mins... Managed to change sleep mode to 15mins - same problem. Can't boot from Disk as same problem, also command+option and shift all still have mouse unmoved!

Obvious change of keyboard and mouse have no effect.

Could this be related to offspring's addition of ipad plugged into usb a few weeks back? He tends to unplug the device without ejecting!

Any clues apart from replacing motherboard would be great!!

 

[flopticalcube]

Sounds like a USB issue. Hard to say if it's related to the iPad. Have you reset the PRAM?

 

[Eidorian]

Are there any other issues with the USB ports? It might indicate a failing logicboard.

Is there anything about the freeze in the logs? Maybe you can see how long it lasts in Safe Mode or even Single User mode.

 

[applemacmac]

Thanks but reset PRAM and nothing in USB apart from keyboard.... will try to get a log before it freezes... latest update it froze whilst re-installing OX10 from CD after 6 mins?!!??!!