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Very strange memory problem 8gb installed 3.74gb usable
I recently swapped in a new motherboard to upgrade my graphics. the board came from a model in the same Pavilion dv6 3xxx series.
Everything booted fine, the bios recognizes the processor and windows installed all the missing drivers right away.
However I can only get half of my installed memory to work. I have 64bit processor and windows 7 ultimate 64bit.
This memory issue is a real mystery. I have tried almost every trick;
-Uncecking memory box is msconfig advanced boot options.
-Ran memtest86 - 6 passes took 8 hours and came out clean
-Ran Windows memory diagnostic with no problems
-Ran bios memort check with no issues
Now here's the strangest part. Even though the bios and windows can detect that 8gb are installed(as in both 4gb ddr3 memory cards), the computer WILL NOT boot on on memory card in the bottom slot. there is no bios, no display but it starts. Does this not indicate a bad memory slot? I can boot with the same card in the upper slot and run fine
But in task manager I see In a grey box "hardware reserved 4358" which is the half of the memory I cant use?
What is the fix??