Accidentally switched off iMac at mains. Now only goes to grey sceen when switched on. Have removed all USB's from ports and cable from screen rear but still grey screen. What next?

Accidentally switched off iMac at mains. Now only goes to grey sceen when switched on. Have removed all USB's from ports and cable from screen rear but still grey screen. What next?

I would reset the PRAM
http://support.apple.com/kb/HT1379
or
I would try and reset the SMC
http://support.apple.com/kb/ht3964

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