It's fairly easy to unseat a video card. If you haven't already done so, take it out and reseat it. Often lack of a video card triggers BIOS beeps and one that's not connected properly will do such too. The monitor's video cable is often stiff and heavy enough to make it easy to unseat the card. Some newer cards have a locking device to help avoid this tendency.
Dell Inspiron 5150
Windows XP SP2
P4 @ 2.8ghz
Nvidia Go5200 64mb
Help! I opened up my computer to clean out the exhaust vent and upon reassembling it I tried booting only to have nothing appear on the screen. This isn't the first time I've taken it apart either, this is the first time I had this problem though. From the way it sounds it starts normally, just the monitor is won't turn on. I'm thinking its the video card, but I'm not sure and I don't know if telling Dell I was inside my computer is a good idea. Any help would be much appreciated.