IMac model A1224 black screen when power on and keyboard not working

Hi,
When I power on the iMac model A1224, it is black screen from startup, and the Mac keyboard seems not working (Press Caps, Nums lock no light), but try that keyboard on another computer, it can work. So please advice what I need to do to solve the problem.
Thanks a lot.

Hi nhiatay,
Welcome to the Support Communities!
The article below may be able to help you with this issue.
I realize the heading states a gray screen, but the troubleshooting steps would be the same for startup issues:
Click on the link to see more details and screenshots. 
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/ts2570
Cheers,
- Judy

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