Computer wont start up after update

today i had an update notification from my update software. So I loaded it and let my computer restart. Well i went make a sandwich and when i came back my computer was still starting up.
Everytime i turn it off (via power button) i get the gray apple and little grey pinwheel then it alternates from a blue screen with the grey pinwheel to a grey blank screen. It just keeps flip-flopping between the two.
HELP ME!!!!
Update:
won't let me load in safe mode.....
Message was edited by: mitchellYO

The operating system disc can only at minimum fix normal directory damage. Extensive damage requires more sophisticated utilities. From the sounds of it, your data isn't backed up, so I really recommend you pursue the course of getting an external hard drive at least bigger than your internal drive, partitioning it, and installing an operating system and data recovery tool on it's first partition, and making its second partition at least as large as your internal drive, and recovering to the second partition your data. This will at least let you try more extensive tools on your machine to get it back to normal, in event the issue isn't hardware related. But since it is impossible to determine the difference between a hardware or software issue, unless the machine actually boots and shows all data, a data recovery program & external hard drive are the tools I recommend getting. If you read my aforementioned backup FAQ, it explains this.

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