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Does the Apple logo or the Pinwheel show on the screen?
There is a problem with you OSX installation. Please boot from the Recovery partition (hold Cmd+R during the startup chime), and use Startup Disk to choose the correct hard drive to boot from. You can also restore from a backup, and not lose your data here as well.
Your macbook is not locating your hardrive. turn off your laptop, insert the Mac OS disc in the drive, and then reboot while holding down the c key to allow it to boot from the OS on the DVD. Then use the disk utilities application from the desktop menu and to a disk repair on your hard drive and then restart.
3 beeps means that it's not detecting the ram cards. It could be you have a bad ram card or simply need to remove and reseat them back into their slots. Here is a link to a free downloadable how-to guide for your mac laptop... CLICK HERE
It sounds like your MacBook can not find the system software to boot up. This is often a sign of a hard drive going bad. Try booting from the CD/DVD that came with your MacBook and running Disk Utility.
You can also refer to this article:
I hope this helps.
Press the F2 key several times to make sure that the screen brightness is up.
Put your ear down on the laptop on the zone left of the trackpad and below the keyboard and listen for the little whirring and clicking noises of the hard drive. If it is making noises, just walk away for at least 30 minutes and see what happens in that interval.
Look carefully at the screen in good light and make certain that here is no image on it. You could just have a bad backlight.
If so, you can connect the DVI port on the MacBook to a computer monitor or most flatscreen TVs and regain access to the screen until you get the backlight repaired.
You might try that regardless. Even if your display is totally inoperative, the DVI port may still function.
If the drive has stopped making noise and the screen is totally blank,
1. Try starting up the MacBook with the DVD that came with it, and if that doesn't yield anything,
2. Take the MacBook to the Apple Store and ask for a Genius appointment.
Put the install disk that came with your laptop into your laptop, hopefully it might boot into the disk, what you have to do is hold down C until it boots. then fix the problem with utility manager.
I hope that works for you since the screen will not show the grey screen.
If this does not work, there may be something wrong with the screen or the firmware,
if that is true then i would suggest taking to your local Apple store and explain your problem to a mac genius and they will sort you out in no time.
Hope i have been helpful,
Sounds like it could be a corrupted OS; have you tried forcing it to start up with the OS disk, holding down the 'C' key? That's the first place to start...
If it won't start up like that, you probably have a hardware problem. (You can get excellent troubleshooting guidance at: http://www.ifixit.com/Guide/Mac/ ) depending on your level of geekness, and assuming the warranty is expired?