Ok guys I know many of you are going to say that I should just read the forums more, well after 20 something articles on the same issue I haven't been able to fix it. I just built myself a new computer. Core i5 750, 4 gigs g.skill ddr3 133mhz ram, 850 corsair psu, nvidia geforce gt220. I am running bios a71.

I have Windows 7 x64. This recognizes all 4 gigs of my RAM but can only use 1.99 of it.

My bios only recognizes 2040mb of it.

I have:
reseated cpu and cooler
performed musical dimms
tested each mem stick with memtest and in the slots
have done the max memory uncheck
have cleared bios so many times I can't count
have done the memory remapping 
have upped the vtt voltage
have manually set the ram freq.
have manually set the ram voltage


I don't know what to do now. I have lost 2 gigs of RAM 700mb of which is being dedicated to my 1 gig onboard memory graphics card. Total of 1760 megs of memory for the video card.

If you guys can help it would be awesome.
The cpu has scratches where it contacts the points and everything, and my cpu cooler is loose as people have said doing that may fix it. Any help guys would be awesome.

Thanks.

Ok, ValerieM this is a Memory not found issue not a board that is not running because the CPU is not there.  There is some memory but not all so the Memory pins must be in correct place.  

This is strange.  I had the problem but making sure the CAS settings and the Vtt and Mem Stick DIMM Voltage were OK as you have done.  I did the unplug the power cable from the chassis, removed the BIOS Battery and waited a couple of minutes and put the battery back in, power cable and the powered up and all was OK.   Perhaps looking on Microsoft forum social.answers.microsoft.com would have this issue addressed.  It does seem BIOS related, but i could be a Windows 7 issue not reading the BIOS correctly and a corrupt registry.  

If it is a corrupt registry, your only solution would be to do a complete reinstall of Windows 7 and all your apps.  Sorry.  Before you do that check in the "Standard BIOS section" I.E. the 1st BIOS screen and see what amount of memory is being reported.  If it is the full 8 GB... then I would say clear disk (even a format from the install disk) bite the bullet.  

done all of that

Yepp I got the go ahead to RMA the board so I'm going to be doing that.

I have the same problem with my computer its running Vista x64 I had all the same problems as you and went through the same steps but never able to get it to run my full 8gb of ram. Currently the computer is showing that I have 8 installed physical memory. 3.99 total physical memory, 2.4gb available.

KenMcC

Ok, ValerieM this is a Memory not found issue not a board that is not running because the CPU is not there.  There is some memory but not all so the Memory pins must be in correct place.   

That's not quite correct, you can have bent pins and the system will still boot.  I've dealt with this firsthand when I worked as a tech at one of Intel's hardware testing labs on the LGA775 stuff.  Quite a few of those pins are actually grounds, but it's conceivable that some of the memory channel pins could be damaged and cause detection issues.