|i doubt that it a win 7 issue, however, try installing another os on a second drive/partition and boot up to prove or disprove this, |
have you loaded the latest vista drivers for the video or using a win7 driver? try both
it sounds more like a hardware issue than software, hot/loose connections maybe, try holding the monitor plug in place while switched on, see if it gets rid of the line, i had a toshiba with similar problem turned out the solder points for the plug on the board were no good.
i hate computers!
but cant help myself....