PC startup issue

[NEM1S1S]

HP Vectra VL.6/266.SERIES.6.DT

Power PC up, no display on monitor (tried a few monitors). PC then beeps twice after being powered on for about 30 seconds. Have tried CLEAR CMOS and will now try steps for "2 beeps" BIOS beep code troubleshooting:

Your computer has memory problems. First check video. If video is working, you'll see an error message. If not, you have a parity error in your first 64K of memory. First check your SIMM's. Reseat them and reboot. If this doesn't do it, the memory chips may be bad. You can try switching the first and second banks memory chips. First banks are the memory banks that your CPU finds its first 64K of base memory in. You'll need to consult your manual to see which bank is first. If all your memory tests good, you probably need to buy another motherboard.

any other ideas?

[TeeDub]

Take out the memory and "clean it." Don't laugh. Use a regular rubber pencil eraser once you get it out along the contacts at the bottom (both sides.) Then put it back in....

Will probably work... As for the why, corrosion can occurr between metals of two different types. (Here typically gold and tin.) Di-electric current or some such.

[NEM1S1S]

As you know HP's can be tricky to work inside, limited room, etc...and there was another PCI card hiding in there which I didin't notice, thought it was a COM1 port for some reason but didn't notice, removed that and PC boots fine.