Monitor refresh issue

[Georgi Kourtev]

Dear all,

I have a laptop DELL inspiron 1525 that worked fine ever since 8.04 up to 
10.04. I did on it a fresh install of 10.10 and after that the monitor started 
to freeze every 10-20 seconds.  This can be seen while pressing page down on a 
webpage, or typing an email, or scrolling through windows, or by dropping a 
menu down -- all that makes it move...   As a visual effect it looks like the 
monitor cannot refresh itself correctly.

This is happening with composing on and off, so it is not that. The monitor 
settings are the same as before.  

Any ideas?
gk