I left my Dell Laptop Studio 1557 in sleep mode and when I turned it on, I heard 3 beeps( first one higher) then monitor stayed completely black while I could hear that CPU fan is working and after a while I heard the windows alert and other alerts which regularly I had when system came up. I changed the RAMs and I heard 4 beeps then kept same as before. Also pushed D button while restarting and saw different colours on Monitor. Could it be a VGA problem? I would appreciate if you could help me.