My dad has an HP Pavilion and he was trying to download an exe. file and he said the PC started to go crazy so he started to restore it to get rid of the virus. Then he tuned it off, the computer boots but there is no display and the power and HDD LED do not come on. He thinks the motherboard is dead and I am not completely sure what could have happened. He also asked me if the HDD would have the virus in it if he were to connect it to another PC?