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Sounds like a RAM problem. Best bet is to purchase a stick of RAM from a store that will let you try it and return it if the problem is not solved. The beeping is a BIOS error code that signifies that something is wrong with your hardware.
If you have 2 sticks of RAM installed try removing one of them and then if the beep code happens again try to swap them out.
Kindly give some more info. As when it stopped working, may be after you installed something or you changed the operating system. If it suddenly stopped working then try to remove it from device manager and reinstall it. Try to clean the lens with the help of Lens cleaning media.
Try reseating the RAM modules first. The RAM may be faulty or reseating to make proper electrical connection. Get the RAM tested in another laptop or at your friendly computer shop.
Can you get into the BIOS configuration?
Did you power up the monitor first then the laptop? This method will divert the video information to the external video port first automatically.
If you don't get an image on the monitor and the hard drive doesn't appear to be spinning, then you could have a faulty motherboard.
I think that the problem is related to RAM. Try to open the RAM from its slot, clean it and reinsert it. Then see if the problem goes. You will find the procedure to open the RAM from your manual. If you don't have it then let me know
I guess I can assume that you have it plugged into the ac power, so you know its not a power problem.
We also know its not a problem with the power switch since the light turns on.
So that leaves, motherboard, cpu, and ram possible problems. Ram would unlikely cause such a hault. Even with no ram, I believe the computer would make horrible beeping noises.
So if its a problem with the motherboard or cpu, its pretty much trash, unless you want to waste the money on ebay or some place for another cpu to try to swap.