A friend of mine has an xp2100 cpu, kt333 ga7vrxp mobo, 1gb of pc2100 corsair cas 2 ram, gainward golden sample geforce 4 ti4200. He recently tested a good quality 512mb stick of pc2700 in there. It worked fine, and when it came time to put his old ram back in, it would not boot. Not with 2 sticks or just one in there. No signal to monitor. He's cleared the cmos, waited at least 2 hours on one of the attempts. Still, absolutely nothing. The mobo will cycle and everything. Just no signal to the monitor. The monitor itself works fine, as he's using it with an hp pc (blech) for the time being. Any ideas?