IMac Wont Boot [plz help]

Hey everyone, so I turned off my iMac two days ago (not a hard boot, I clicked on the apple logo top left corner then clicked Shutdown.) because I was really busy and not going to be home a lot. Now that i'm home I went to turn it on I get to the white screen with the Apple logo and then it goes to a darker greyer colour and I get this error
panic(cpu 0 caller 0x0043913f): "unable to find driver for this platform: \"ACPI"\".|n"@/SourceCache/xnu/xnu-1228.15.4/iokit/Kernel/IOplatformExpert.cpp: 1407
Debugger called : (panic)
BackTrace (CPU )), Frame : Return Address (4 Potential args on stack)
(there are some numbers and letters here)
BSD process name coresponding to current thread: Unknown
Mac OS Version:
Not yet set
Kernel Version:
Darwin Kernel Version 9.8.0: Wed Jul 15 16:55:01 PDT 2009; root:xnu-1228.15.4~RELEASE_I386
System uptime in nanoseconds: 244655389
Then there is this box in the center of the screen says:
You need to restart your computer. Hold down the Power button for several seconds or press the Restart button.
(same thing in other languages here)
I have tried restarting my computer several times and I still get the same thing.
This is my main machine and has all my stuff on it, I need it fixed asap. If anyone could help me out it would be VERY appreciated!
Thanks a lot in advance!
(Note: This is a 20" iMac I bought around september 09 I believe.)

Send it back, you should have a lifetime guarantee.

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