My mac won't start up it keeps on chiming tried o

My mac won't start had a power cut and now all it does is chimes.
Tried to press options and c but still continues to chime

You could try the ol SMC reset.
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.
http://support.apple.com/kb/HT3964
If it still does not work, Restart using your 10.5 Install DVD as the boot volume holding down C from chime sound to apple logo appearance, then after selecting your language from the menu bar go to Utilities > Disk Utilities, and run Repair Disk on your Mac's HDD. Afterwards, exit DU, exit Install, restart normally.

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