Two Monitors Problems

I am having two different problems with two different monitors.

1- Philips 7CM5299/89T
A shiny line appears at the bottom (where the task bar is) of the screen.
Sometimes a tap on the monitor clears it but it comes back after some time.
Sometimes it comes quite frequently and sometimes it takes time to
(re)appear.

2- DELL D1028LR
I recently purchased this (used) monitor. It was working fine for month or
so. But for last 4/5 days its screen gets bigger (about 5%) and than slowly
comes back to its position. At the time of the problem, picture goes some
what black, colors increased. Is heat the cause as it is about 45C here. I
also use TV Tuner which worked fine for last five years on above (Philips)
computer.


TIA

--

Farhan