Blurry Monitor. Help?

It could be the cable itself, the plug on either end of the cable, or one of the sockets the cable plugs into. My instinct would be to leave it; if it happens again you can try to diagnose it down by, say, swapping the cable with a friend or family member to see if the problem moves.

Or if you’re not short of a dime replace the cable - it’s certainly the most likely candidate.

I’ll keep it in mind.

Yes it does. (Not by default, but the setting is available and usually well worth using. I love the Clear Type on my XP system. It can be problematic on a few monitors, however, if it is not further tweaked).

Your problem sounds like a hardware failure. However, you could try the Microsoft clear type tuner made for blurry screens. I found it helps.