Question Yellow DRAM light no post after 3 weeks away.

Jan 26, 2022
Hi all,
Just thought I'd give this a try because I'm stumped right now. 3 weeks ago I went on holiday and I just got back the other day, I unplugged my pc from the wall and just left it. Came back 2 day ago to find it giving me no POST and a yellow DRAM light. I've taken apart the majority of the PC, tried every combination of RAM and still no luck. 2 times I got lucky and it made it to the POST and gave me a repair thing after but that was without the CPU fan. Once I put it back on it reverted to the DRAM light no POST. Currently it seems its MOBO problem if anything, but if anyone has any ideas it would be greatly appreciated (not too keen on buying a new MOBO without being 100% sure). Thank anyone