ive just bought a v20 laptop off ebay, i turned it on and worked perfectly, ut it was so dusty in side i had to strip it all and clean it before it went bang. i put everything back together as it went, nothing got broke or n e fin, and now when i turn it on its just a white screen, does any body know what this means? or can any body ell me what the problem is so i can try and fix it, thank u