What happens when you remove the dummy RAM?
Try more permutations with the RAM.
Remember to name the RAM 1, 2, 3 and 4.
Put in the first piece of RAM into slot 1. Then start the PC. If
the PC starts up properly, shut it down, put into the second slot.
Then try again. Try all permutations till you hear a beep.
It means either that slot or that piece of RAM is having
problems.
Unplug your LAN card, graphics card (if you have onboard graphics,
otherwise don't), sound card and other cards that you have. Make
sure you have your monitor, hard disk, graphics card, RAM and
keyboard is plugged in. Then start your PC.
If they have no problems, add in the cards back one by one.
If you have problems, it could be your graphics card, hard disk or
keyboard. If you have spares, get a spare and start up the PC.