Inspiron 1520 pp22l motherboard gone?

Hey

My pc was starting to go on the fritz, so after some hard drive issues I decided to install a new internal drive.  After a few good days my computer started to freeze an have thin black and white horizontal lines cross the screen.    This didn't happen during anything graphics-intesive, which makes me think its not a video issue.  After a reboot all was fine for a bit, and then it did it again.  Now it's happening before windows even gets started.  Any ideas?