I recently built a new machine. Decided to wait on buying a graphics card and ran off the integrated graphics on the i3 CPU. Unfortunately my mobo only had a VGA out so I was stuck using that. Problem was, the text never looked quite right. Always seemed a little unclear. I tweaked the monitor settings, swapped out a different cable, messed with cleartype, ensured it was the proper resolution... nothing seemed to fix it. A few other people who looked at the monitor didn't see what I was talking about so perhaps I'm nitpicking.
Fast forward to today, I bought a GT 430 and connected via DVI. The problem is no longer there.
What could cause this? Bad vga port on mobo?