Pavilion LCD blinks

My 3 year old ze4560 pavilion lcd blinks. You can see the image move
about four or 5 inches then returns to where it was. I plugged in an
external moniter which worked fine. I can't afford a new laptop right
now. Any help would be greatly appreciated.

Thanks

Does this happen with movement of the laptop or just a random issue

It has nothing to do with movement. It just blinks.

Thanks

Consistent or Random in timing? This matters...

It blinks randomly.

Just to let everyone know it was a maxed out cpu problem. I found i
by looking at the task manager. I took down some processes that wer
hogging memory and it stopped. It is still using to much memory
Probably has a virus thanks to SBC DSL which is like an open door.
switched to a cable modem with a router and have about 1% of th
attempts on my firewall that I did with SBC. I am going to do
reinstall of XP

Thanks :