Computer does not see 500 gb hard drive anymore

SOURCE: knocked over my seagate 500 gb hard drive. makes a

you say its beeping? like an error code sequence? i would search the intnet for seagate error codes and try to match the code with the problem. or call tech support.

SOURCE: SimpleTech 500 GB external hard blinking red light

I got one with the same problem. I opened up the case and hooked up the hard drive to a generic usb to sata adapter that i picked up on ebay and it works fine now if a bit clunky looking.

SOURCE: Seagate ST3500630AS SATA 500 GB hard Drive

You will have to send it to a data recovery company in order to retrive the data sounds like the circuit board failed therefore the drive is not receiving power.Usually if this board is good you would hear the drive spin up.
Good luck

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SOURCE: my western digital 500 gb hard drive is not recognized

that offten happeneds when your memorie space is low or many files have been corrupted.