No restart, no safe mode, no single user... help please

Hi, tried a few tips from the net, no results,
All started with the grey screen and unable to restart it, try the safe mode, not starting, tried a few time with the command R, erased the HD several times, reinstal snow leop twice still no luck . just tried single user mode, get can t the command line... Any other trick I could tried before the Mac shop ?

Throw some more stuff at it. PRAM reset: Cmd-Option-P-R at startup chime from a full shutdown. Also SMC reset. And remove all peripherals except essential ones, like a wired keyboard or mouse, if you are using those.

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