I have had my pc built since lockdown in 2021, just the other day i turn on my pc and i get bios error code 0d, after searching it says its an issue with RAM. so i order a new pair of RAM sticks. whilst i was waiting for them to be delivered i try my old ram sticks, and the pc boots no problems. so i think oh my original ram sticks must of developed a fault. my new ram sticks arrive, install them in the same ram slots as the original and i still get 0d. I reset the bios, clear the cmos and still no post. i then stick the old sticks from my other system and everything boots. after days of change and swapping i get different error codes, i change my cmos battery, i plug my gpu straight into the pci slot instead of the riser i have, to no post. so i stick in one of the old ram modules, with one of the original ram modules, and it boots post and i go into the bios, the old ram module is recognised along with the one that originally didn't boot . so i power off but my original ram modules in and i get 0d error again. i am at my wits end, and don't know what the issue is, it can't be a incompatible issue has the ram modules i had since i built the pc with no issues. now i can't get a post boot on ram higher than 2133. is it a motherboard fault, is it a bios fault? please help