HELP: My MacBook was on sleep mood then would not reboot, eventually it did and i has the sleep mood light flashing 3 times and like a siren noise going off .

Help please
I used my MacBook yesterday and left it on sleep mode as usual. The battery had drained during the night. So I plugged in the charger and it started up as normal. Then a notice came up saying shut down using the power button as an unexpected error had occurred. I done as it asked then I could not reboot or turn on at all. It felt like a power surge was going through the laptop. I eventually got it turned on and sent the report off to apple. The screen kept flickering so I turned it back off and took the battery out and tried to turn on again. This then proceeded to make the sleep light blink 3 times and then there was a siren sounding noise and a blank screen, I turn it off and now I have managed to reboot and all seem to be working fine. I am really worried as I love my MacBook and cant afford to replace it.
Thank you for your help in advance

kerryll wrote:
 It felt like a power surge was going through the laptop.
You felt electricity zapping you when you touched it?
Backup everything!!!
Put in your Install DVD & boot while holding C
Go to Utilities > Disk Utility > Repair Disk & Repair Permissions
Also put in your extra Applications Install DVD
Hold D while booting & run the Apple Hardware Test.
If no error's, run the Extended Hardware Test.

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