How to troubleshoot possible bad DIMM slot

How to troubleshoot possible bad DIMM slot dimm slot not working I can fill the blue DIMM slots to capacity using the RAM recommended from the respective motherboard webpages with no stability issues, but as dimm2 slot only adding ram into slot 3 and 4 would work but thats no use With a lot of head scratching and prodding, the computer managed to boot with

dimm2 slot If a known good DIMM is not seen in a certain slot, first make sure that the slot is enabled in the BIOS program (F1 key or Del key on IBM logo

dimm slot not working only adding ram into slot 3 and 4 would work but thats no use With a lot of head scratching and prodding, the computer managed to boot with Remove all RAM sticks and place one you know is functional into the first slot on your motherboard Boot your computer If it starts without problems, you know