computer monitor question

[trof]

I'm getting some very thin, barely visible black lines rippling around in the bottom half of the screen.
Should I duck and cover?

[TrogL]

1. run screaming for the hills

Listen for a high-pitching whining. Your flyback transformer is probably going.

If it's on warranty get it fixed now as it may take awhile for it to blow completely.

[trof]

2. That's a relief.

I thought it was the strunch.
whew

[Booberdawg]

3. There is a knob, usually under the monitor, to adjust tracking. Try that

[mmm]

4. Be sure to check the cable

A bad connection can cause that problem.