24" iMac (Intel based) does not boot.

Hi there,
My iMac 24" refuses to boot, OS Lion present but no recovery nor anything else.
If i try to diagnose the machine, this message pops up "! OUCH !!! : mshdlr loc zero not zero ! 00007007000000000h @:eeeeeeeeeeeeeeeeeeeeh"
Tried to replace RAM, detach HDD, inserted Lion or any other OS but results in a blank screen after spin.... It hangs somewhere but no idea.
Thanks to you all for the eventual responses
Cheers
Erik

Do some basic resets such as iMac SMC and PRAM reset . If those don't work double check the connection, check to see if it's the plug socket, power strip or other connection. If you eliminate those then and it still won't boot if the machine is less than a year old it's covered by warranty however if you bought AppleCare it will also be covered. If you have AppleCare give them a call and they will do some trouble shooting over the phone and if it still won't work they'll help schedule an appointment at your local Apple Store. If you don't have an Apple Store in your area,you will need to take it to an AASP and AppleCare can help you locate one close to you.

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