am using nvidia 7300 se...while using this lines are coming in display..while i connect my viewsonic monitor dirctly to mother board line goes off,,so wat is the problem actually..pls tell me a way to overcome this
Knowing little else but what type monitor and video card your using and the fact that the Nvidia 7300 is quite old in GPU years I'd say it's time to replace it with something more present. If you motherboard has on board graphics I'd run with that until you could get another GPU. Your on board can't be that much worst than a 7300 sad to say.
Sounds like the video card has failed and will need to be replaced. On the bright side if your board has PCIe you could get a 8400GS for around $25 online.