There are no beeps and have tried restting the bios settings. Is the RAM counter the looping sound at startup? If so, then there is the sound of the RAM counter.
Any beep at POST?
Any other sounds (like the RAM counter)?
Remove all the components except the graphics card , processor and ONE mem stick. See if it will POST then. If it does add components.
Check the power supply is compatible. Some of the 486 had different power needs but I thought that was only the 486DX 4 100.
Remove the battery on the motherboard for a few minutes to reset it to the fail safe BIOS settings.