Can i recover from grey screen without install disk

i done an update on my iMac OS X 10.5.8 which required a restart when it came back on it only booted to grey screen with a question mark in the centre.
I have no install disc

If you are still on 10.5.8 probably not, however you can probably still get a replacement set of install discs from Apple. For a nominal fee they will ship them to you, all you need is a credit card and the serial number of the machine.
However before going to those lengths, try doing a Safe Restart, this might work if it's not a hardware failure. You can get instructions by clicking:
support.apple.com/kb/ht1455

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