As soon as you power on, press the F8 key about once a second and see if you can get to the Advanced Boot Menu. If you can, boot to Safe mode. Check Device Manager to see if your display driver is installed. If you haven't installed it, you need to.
Another thing to do is to read your user guide and find out what key you press to get into the BIOS setup. It's F2 on my laptop buy YMMV. If you can do that, you may need to disable any integrated graphics on the mobo to keep from conflicting with your discrete video card.
If neither of the above works, try removing your video card and then boot. If there's a conflict between it and the integrated graphics, that should at least get you something on your monitor.
When you boot from your install disc, do you get a display? If so, your video hardware is working at least in 640 x 480 VGA mode.
So I just put together my first custom build and was happy until the display never showed up. I tried VGA, DVI and HDMI and nothing worked. The system boots up, the fans spin, the HD makes its usual sounds, the disc drive works, the fan on the video card is going, the motherboard lights are on...Everything seems fines but I get no display. I've tried pretty much everything!
All parts are new!
Here is my build:
IN WIN fanqua Black SECC Steel (0.6mm ) ATX Mid Tower Computer Case
ECS A990FXM-A V1.0 AMD AM3+ 990FX 4x DDR3 6x SATA DUAL LAN DESKTOP MOTHERBOARD
AMD FX-4300 Vishera 3.8GHz (4.0GHz) Socket AM3+ 95W Quad-Core
MSI AMD Radeon HD 6770 R6770-MD1GD5 1GB GDDR5, DX11 PCI Express 2.1
850W Gaming 120MM Fan Silent ATX Power Supply SATA 12V
G.SKILL Ripjaws Series 8GB (2 x 4GB) DDR3 1600 (PC3 12800) Desktop Memory
Seagate Barracuda 7200.14 ST3000DM001 3TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive
PLEASE SOMEONE HELP IF YOU CAN!