ram slots 2 and 4 not working: Dell R740 not recongizing memory module in slot A1. Will DDR5 RAM Work on DDR4 Motherboard? (2025) - PC Guide 101. Can I mix Ram Sizes? - Page 2 - Windows 10 Forums.
Ram
slots A1 and A2 not working, they worked before but then I took the PC apart and now they don't work anymore. The motherboard is MSI B250M Pro VDH B1 and B2 works just fine, I can enter windows and go on the internet and everything.
If you have inserted a RAM stick in
slot 4 and 1/2/3 it does not boot, and that stick works in
slot 1/2/3 and you have inserted it properly it is perfectly possible.
Though the PC is running with both RAM sticks on A1 and A2 slots, I fear it can damage CPU when doing heavy works, since one optimized
RAM slot (B2) is not working.