Today, I picked up two Dell Optiplex GX1s. The first one I tried worked perfectly. I had to fix some of the BIOS settings, but It was fine after that. After testing the first one, I moved on to the second. I discovered the second had no RAM. So I took 1 of the 3 sticks of RAM (the one in the furthest back of the 3 slots) out of the first one and put it into the second one. The second one also works great. After testing the second, I hooked up the first. It would no longer show video, even though it worked perfectly the first time I tried it. So I put the stick of RAM I took out back in. Still nothing. I tried reseating all the RAM several times, nothing. Finally I tried each individual stick of RAM in the slot closest to the processor slot. It still won't display video. The hard drive spins up, the fan comes on, the lights on the keyboard flash and the light on the CD-ROM drive flashes. But it just displays no video. No beeps either. It worked flawlessly before I removed the one stick of RAM. What happened? What else can I try?