My new graphics card (nvidia geforce 6200a, AGP) arrived not long ago, and today I installed it, but there appears to be a problem... my monitor isn't working. When I first put the graphics card in and turned the computer on, the monitor was just flashing orange. I then turned the monitor power off for about 20 seconds and turned it back on and then my monitor was permanently green, but nothing whatsoever. I have onboard graphics too if that's revelant. My monitor is also very old but has worked perfectly fine before.