I have a Dual CPU with a MSI motherboard. I checked CPU`s and also check video card and checked the monitor on another computer which it works OK. This computer was working fine for a long time with no problem then all of a sudden after a hit of a virus I thought I had fixed. Initially on boot up you here the bing that tells you it is booting and the four lights on the motherboard light up but the monitor only shows a white screen. Any help, thanks

Try a different Motherboard if you can...

Does it have on board GFX?