Monitor signal problem. Cables are in securely though. I have double check and yet there still is no image?

Question

My monitor says "check signal cable" That's my DVI cable right?

Trying to install windows vista on my new custom built computer? I have a Samsung syncmaster and all I see is a floating box that says check signal cable.
How DO I FIX THIS. Please Help
Additional Details

19 seconds ago
I have checked and double checked the connection of the DVI cables. I guess the Video card may not be in all the way or tight enough.

The thing that confuses me the most is that the there was a connection because I got to the windows intallation screen. A message said that windows would restart multiple times which never happened that I can remember. After the screen was blank for about an hour and half I got worried. So, I restarted the computer. Since then the monitor either says no signal or there's just a flashing blue light.


I don't know what could be wrong!
Help

Answer 1

If the video card was not seated properly, it broke the conection when the computer was restarted by coincidence or you may have jarred the computer.

You should shut down the computer and disconect all peripherals and the power cord.

Remove the video card and reseat 2 or 3 times (make sure you are properly grounded to the metal chassis of the computer).

This will wipe the connections clean and make a solid connection.

Do not force the card.

Good Luck.