Hopefully, I'll be able to help you troubleshoot your problem..
I "poked around" for a spec-sheet on your motherboard:
As you're probably aware, this is (in computer years) an antique, but still workable, assuming all cables are in good shape, and tightly connected. -- Again assuming all the cables are good and properly connected, the FIRST THING to try is to replace the bios battery, as it is quite an old motherboard.. considering the age, it is very likely that the battery (if original to the board) is dead, and unable to hold a charge. Motherboard batteries are cheap, easy to find and fairly universal. Try picking up a couple at your local electronics store / dept.. bring the battery along with you for reference.
After you've changed out the battery, make sure you do a bios reset on the board. Find the jumper on the motherboard (mobo for short). with the board properly connected to a power supply, and all needed computer components, take note of what position the jumper is in. With the board / computer being powered down, and the power supply (PSU for short) being unplugged from the wall, move the jumper to the opposite position. Wait about 10-15 seconds. Plug the PSU back in. Wait another 10-15 seconds. Unplug the PSU again, and put the jumper back into its original position.
Then plug the PSU back in, and try to power up the computer. If the problem still exists, unplug the PSU. Ensure that the RAM "sticks" AND the CPU are properly seated in their respective slots / socket.
Then again plug the PSU power cord back in. Try to power up the computer. Assuming that the mobo hasn't failed due to its old age, the computer SHOULD correctly "fire up", and you should be good to go. Feel free to contact me with any further questions!