Dual Monitors Won't Start

Hi,
About 3 or 4 days ago, both my monitors stopped working. I could turn on my PC, but the monitors would not recieve any signal. It had happened before this, but after rebooting 3 or 4 times, they would start.

I just purchased a new motherboard, ASUS P5Q-E with Wi-Fi/AP, as well as a new graphics card, Leadtek 512MB, which only cost me 50 bucks.
Before this I was using an Asus P5K se/epu, as well as a nvidia 6600GT 256MB.

Even after completely reassembling my computer, I still get zero signal from my monitors. One is connected through DVI, and the other VGA.

I thought it might be the monitors themselves, (even though both breaking down seems unlikely), so I plugged the VGA into my brothers laptop, and it came on perfectly.

Anybody have any idea why my monitors aren't starting?

First step - unplug both monitors. Second, make sure you have your graphics cards seated properly and in the right position. Does your mobo have on-board graphics? If so plug one into it and see if it boots up. If not, then try the other two one at a time to see if either works (this may require one card at a time). At every step, be sure to make the connections nice and tight, as that could also be contributing.

If you got any response from boot (processor, memmory, etc.) it is possible that you don't have the right resolution set up correctly.