[NAME]  - You might just need to reseat all RAM modules in their slots. If that doesn't help, test them one at a time in the DIMM slot with lowest number (might be "DIMM 0" or "DIMM 1")*. It probably will be the 2nd slot from the CPU. So look on the mobo to see if the slot numbers are marked. If no problems with any module in lowest number DIMM slot, try them one at a time in the next higher number DIMM slot, which should have the same color retention clips as the first slot you tried. *Unfortunately, the Service Manual doesn't show the DIMM slot numbers.  
Approximately 80% of the time, I experience a Memory Management stop code blue screen when choosing Power > Restart. That's the only time this happens. I've run every diagnostic tool recommended on the web for this issue, such as Windows Memory Diagnostic and MemTest86 (both pre-boot), Dell's built-in pre-boot hardware diagnostics, Dell Update and Windows Update to check for updated drivers), Intel Driver Support Assistant, CHKDSK on all drives, SFC /scannow and DISM to check/repair system files, Verifier to check device drivers (only briefly) and--guided over the phone by a Microsoft tech--reinstalled Windows 10 version 21H1. None of the tests generated errors. I also removed and reseated my two 8GB matching RAM SIMMs. This has been going on for 3-4 months. I'm not positive, but it may have started when I updated from Win10 version 2004 to 20H2 (followed later by 21H1). About the only thing I haven't tried is downgrading to Windows 10 2004, but don't see a way to do that. The closest Dell support article to deal with this issue doesn't include the Inspiron 5680 as an affected system: Some Computers May Hang or Present a Blue Screen with Stop Code: MEMORY MANAGEMENT Error Anyone else having this issue?
Inspiron 5680 Memory Management BSOD on Restart