2.4ghz Intel Core 2 Duo iMac freezing when trying to update and non responsive

I have a 2.4Ghz Core 2 Duo iMac. The updates download but when the mac tries to restart to complete the process the screen is just grey with a tool bar across the top System Updates, however the imac is completely unresponsive and will not even force quit. I have even left it overnight on a couple of occasions in case it is due to the size if the update but to no success and have to turn the machine off manually. It operates and functions during use but freezes when shutting down.
Any one have any experience of this or suggestions please?

Bootup holding CMD+r, or the Option/alt key to boot from the Restore partition & use Disk Utility from there to Repair the Disk, then Repair Permissions.

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I was just wondering is my IMAC 64 bit ? My Machine model is imac4,1 I got mine last May.

OK yeah mine is a Intel IMAC thats what I said lol, Oh well I guess I dont have the 64bit that ***** I bought this then then came out with the better Core 2 with 1gb of Ram, and it was cheaper lol, OOO well. THanks anways

2.4ghz Intel Core 2 Duo iMac freezing when trying to update and non responsive

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