Boots fine but screen stays blank, any ideas?

Just replaced my right fan, and while I was at it decided upgrading to 2GB of ram instead of 1, and replace the battery. Got the MBP back together and plugged in, light turned green turned on the computer, could hear the fans and HD boot, but screen stayed blank. The light on the lid latch stayed on but dim. Pulled the battery and unplugged for 1 minute, plugged it back in and same thing. DVD drive does the boot but like 10 times in a row then stops. Any ideas would be great. Also the two sticks of RAM were from 2 different manufactures does that matter? Purchased all parts here.

Eric