Need Help on Screen Flicker - Horizontal Lines

Hi All,

I recently changed my PC (except for the monitor) and now my monitor has 2 flickering 1.5” horizontal lines. It starts at the bottom and moves up or sometimes the opposite. I’ve also noticed that the time for a line to complete its travel varies from 3 to 5 seconds. The lines are constantly there: desktop, games, movies, etc.

At first I thought the lines were caused by the onboard graphics card of the motherboard. But I just upgraded to an HD 4670 card and the problem is still there.

I didn’t have that problem on my old PC, even if it had a heat problem and sometimes crashes. My old PC was a P4 2.8ghz with an AGP 6600GT graphics card. Also, I can run my monitor at 70-75Hz with that PC. And now my new PC can only run it at 60Hz. I’ve read that my monitor can only support 60Hz at 1440x900 but how did the A6600GT manage to reach 70-75Hz?

Here are the details of my new PC:
I know it’s not “new” new. But it is a “new” hand-me-down. =)

ViewSonic VG1930wm @ 1440x900
Intel Board D946GZAB --- updated drivers from Intel site
Intel Pentium(R) D 3.00 GHz
1GB DD2 667 RAM (1 stick)
ATI PCS HD 4670 512MB ----- with Catalyst 10.6
Seagate HD 40GB

Windows XP SP3
DirectX 9.0c
BIOS Version: AB94610J.86A.0140.2006.1213.2204
BIOS Date: 12/13/2006

I also downloaded the Intel Desktop Utilities and it shows:

Processor Temp : 57 C
Sys Zone 1 : 42 C
Sys Zone 2 : 45 C

Processor Fan Seed : 2526

+12 Volts : 12.000 V
+5 Volts : 5.133 V
+3.3 Volts : 3.300 V
Memory Controller Hub Vcc : 3.151 V
Processor Vcc : 1.212 V

I apologize if I included irrelevant information here. I just wanted the information to be as complete as possible.

I appreciate the help! Thanks in advance!