Microsoft poser equals dead computer

My school teacher daughter got a phone call posing as Microsoft stating that she owed seven years of fees for not registering Windows which with penalties was several hundred dollars. After phone negotiation it was reduced to a sum she was willing to pay. She allowed him to install software on her computer to take over and help her set up the payment. Hard to believe but she was set to give him the last four digits of her bank account when she got cold feet and called me. As soon as I could absorb what she was saying I told her to stop. As soon as she hung up to call me he started sending ugly chat messages calling her a **** and other names. She couldn't get out of the program so I told her to turn off the computer. Now the computer puts out no video. It acts like it is booting normally. The hard drive spins up and makes the proper accessing sounds but no video out. I get no beep cades. I have changed to a known good video card and monitor. I changed out the memory. I have tried booting from the CD. I have disconnected everything but the keyboard and monitor. How can someone who takes over your computer cause a problem like this remotely? I don't see how a virus or any type of software can cause this type of problem. I can't even reinstall Windows since I have no video. Any ideas please.

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