I was gifted a 2005 Dell Dimension 5100, 2.8 ghz, 160 gb hard drive, 4 gb ram. I don't know if it is a 32 or a 64 bit, as I have conflicting info. Originally Win XP, I am now running Win 7 32 bit. Worked great for 3 years, but upon last startup, I have a blank screen. Monitor works, as when I push monitor's menu bottom, monitor status light turns green, and verbage briefly comes up on screen, then changes back to amber. Computer powers up, fans run, power light is lit on mother board, and I can feel hard drive spinning. I replaced the video card already, still no go. Can anyone help me with what I can do next to isolate the problem? This is a secondary computer for me, and due to it's age, there is a monetary limit on how much I can justify spending. This will be more of a learning project. If I ultimately need parts, I will need help on selecting the correct ones for this computer. Thanks in advance.