Hmm, a new motherboard and RAM shouldn't change your appearances, unless you changed your screen's resolution? Have you tried checking in your browser settings for display/default font sizes?

Because you still have your same hard drive, OS installation, etc, just a new motherboard? That alone shouldn't change anything like that, lol, since I recently got a new motherboard/RAM/chip too and when I booted back up everything was exactly as I'd left it.

The only other thing I can think of is, do you have an on-board video card, as in, is your video card a part of your motherboard? If it is, that may be the explanation, but if it isn't (as in you have a separate video card that is NOT a part of your mother board), you may just try reinstalling your drivers for it again, but still, that shouldn't change anythin.

That's really odd!