Both Laptops same thing blank screen

I have two identical laptops of one I just changed the heat sink and fan. I put in new 250 GB Hardrive which at first it would not read. Then after turning on a second time now the screen does not come on at all but lights turn on and can hear the drive running inside the laptop. Hold the off button and can hear it turn off. Dont know what to do because I put the hard drive in the second identical laptop only difference has a web cam accesory built in and it now does the same thing.

HELP PLEASE :(

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Do you have the original hard drives?

If so, does it do that when you put one in either system?

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