Windows picking only 3,4 out of 4 gb ram

[texnoi]

Current bios version M73 01.41 Rev.A

System is only picking 3.4 GB and the rest is not usable. The issue occured after updating to the latest bios. I tried reinstalling windwows 10 and even i got back to 7 ultimate  (all x64 ) ,but the resault is the same. 

In the System configuration menu there i have not checked the max memory or processors.

I tried going back to the older 01.16 Rev.A using a recovery USB and holding down Windows key and B key and power key, but i only have a black screen and a blinking CAPS LOCK key. 

-The newest bios is working and the PC is functional ,but not using all the installed memory

How do i fix it or downgrade is the question. 

Thanks in advance !

[y2ken · Accepted solution]

The difference between what you see as 'installed' and 'usable' memory is being used by your integrated Intel graphics chip.

Intel graphics have Unified Memory Architecture and don't need "dedicated" Vram - they get memory dynamically from the operating system when they need it.

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[texnoi]

Yep, you are right . Never though of that as a possible solution. Thanks for saving me lots of headache !

Have a great day,mate !

[y2ken]

You are very welcome! Glad I could help.