When reading about RAM limits with 32-bit OS it usually will say that Windows can't display the full 4GB RAM, usually about 3.5GB or so. I've not seen a 32-bit install fail to work just because it had too much RAM on the motherboard. Makes me wonder if a more sophisticated testing method would reveal more.
I don't mean to hijack the OP's thread, but this is what happened to me......I purchased 4gb of RAM and installed it into a 32 bit machine, along with the original 2gb of RAM......then I read somewhere that any more than 4gb, in a 32bit machine was a waste......so I removed the original 2gb of RAM and put it into another Toshiba, different model number, but surprisingly it fitted....so I now have two machines with 4gb of RAM, running W10 64 bit.......and both are fine, and quite fast.....
Probably true but I have a 2-mo. old Notebook with 4GB running Win11 Home just fine. This Notebook was cheap at $179USD but also included Microsoft 365 1-year subscription. Win11 is only 64-bit, no 32-bit although it seems able to run the same programs as Win10. Usually added programs can make a bigger difference
Can't the BIOS setting be changed to show dual-channel? The only time I've seen 2 modules not run as dual was when the modules weren't identical, were mismatched.
When installing or removing memory sticks, remove the power cord from the outlet.
Test with one stick and then the other one on its slot. Maybe one stick is damaged or not well inserted.
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