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Hi, I have a really old laptop sony viao vgn tz37cn that has a broken screen. I replaced the display by carefully checking the serial code and wearing an anti static wrist strap. Everything was fine but after I have done the replacement, I tried to boot up the machine, but there is no display, no hard drive movement. However, the fan is spinning, the power light is on. 

I turned off the machine, took off the memory wiped it and put it back, it was still not working. I tried to unplug the motherboard battery and put it back. Still didn’t work. Anyone know what is going on out there? Thanks.

Are you getting logo of sony and then goes to blank Try to restart your computer while pressing F8 and check whether you are able to boot into windows with working display.