My iMac does not start up after Mavericks upgrade

Hi,
I have a 2010 27" iMac with OSX.6.8 (if I remember well). Yesterday, I made a backup on an external drive with Time Machine, I downloaded Mavericks, proceeded to installation and when it restarted it got stuck on the grey screen.
I've tried every procedure from the Apple support, nothing worked.
Please help. I'm not living close to an Apple store and I'd love to figure this out by myself.
Philippe

Hi Philippe,
Has this iMac gone without AC power for extented periods?
If so likely the PRAM Battery is dead.
Couple of things to try...
Hold alt key at bootup, what boot options show up?
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.
Have you done a PRAM reset, CMD+Option+p+r...
http://support.apple.com/kb/HT1379
In fact, do 3 in a row, takes a bit of time.

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