Hi Folks, I have a strange horizontal streak in my Hp 24 inch LP2465 monitor using the DVI cable. And for the life of me I cannot figure out what is wrong. When I first built the PC in Feb 2009. But for last few months the streak has emerged.
You said when you use dvi what about vga connection?
It looks like the cable strip in your monitor came loose or your screen is broken.
Are you sending an analog signal instead of a digital signal from the Lenovo T61p? The DB-15 port on the T61p is analog only which explains the difference in response by the monitor to the input signal.
You can also try updating your graphics drivers. Have you tried this monitor on another system? If it has problems on the other system its probably the monitor. I imagine it is still under warranty.
I'd bet money it's a monitor problem. When you get defective rows of pixels that never move, it's usually an internal problem. A bad DVI/VGA/HDMI cable wouldn't cause a set row of pixels to not work. The way data is streamed in DVI and HDMI, if you lost a data line or a clock line, it wouldn't do anything like that. If you lost a color line or a vsync / hsync line in a VGA cable, it does nothing like that either.