Blank Screen after starup (like uploading but not)

Hi and help please. I own a 27in Mac. It has been receiving all updates and it has been working perfectly. This afternoon, I start it up, a status bar appeared , and then a small rotating circle indicating some sort of processing. I assume and update was being made. After one hour, and checking my internet connection (3.5MBps) I saw no change. I restarted and situation is the same, no change at all except the blank screen with the grey apple and circle indicating status of some process.
I inserted the CD Rom with Snow Leopard to try to affect it somehow, but the disk is not uploading. You can hear some HDD noices in the beginning, but then they stop.
Please any clue or tip to make it work normally again.
Francisco.

If you have the drive backed up, erase the drive first with your Disk Utility and then do the install.
Dave M.
Check out the new remodeled MacOSG website! 24-hour Apple-related news & support.
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