I have a problem... In fact, by one or another silly coincidence, I've had the same problem twice.

1.
I tried installing an extra 256MB of DDR-266 on my 'old box' (Athlon XP 1800, Radeon 8500, Asus K7A-266). I got the BIOS-beeps for bad memory sticks. I removed the second (the newer) one, and restarted the box. All fans started running as usual (even the one on the Radeon), but there's no signal on my monitor. I replaced the Radeon with another AGP-card: still nothing. I removed all the memory-stics: BIOS-beeps. I disconnected everything but the Radeon...still nothing. I even tried a PCI video card....
The memory I tried to add was exactly the same as the original (Apacer).

2.
I assembled a new Abit KX7-333 with 512 DDR (Apacer 2 x 256MB 333), a Radeon 7500/Abit Siluro GeForce2/Creative Geforce2-Mx400 (I tried all those combinations)... same problem: no monitor signal. I tried it with only 256DDR, I tried it with those three video-cards, I tried it... actually, I think I've tried every possible combination...

I'm sure it's not the monitor(cable) and not the AGP-cards... Any other suggestions?

Right now, I'm assembling another Abit KX7-333 RAID with 256 DDR and a Radeon 8500... If this one doesn't work, I'm gonna cry...