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Windows 7: Very strange memory problem 8gb installed 3.74gb usable

25 Feb 2014   #1
seven09

Windows 7
 
 
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??


My System SpecsSystem Spec
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25 Feb 2014   #2
whs
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8
 
 

Can you show us this page: Control Panel\System and Security\System
My System SpecsSystem Spec
25 Feb 2014   #3
seven09

Windows 7
 
 

Quote   Quote: Originally Posted by whs View Post
Can you show us this page: Control Panel\System and Security\System
Yes, thanks for the reply. This is the updated experience index too so you know.



My System SpecsSystem Spec
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25 Feb 2014   #4
Britton30
Microsoft MVP

Windows 7 Ultimate X64 SP1
 
 

Is Resource Monitor, sort the various memory usage columns to find what is the hardware hog there. Something is using way more that its share.

Very strange memory problem 8gb installed 3.74gb usable-resmon.png


My System SpecsSystem Spec
25 Feb 2014   #5
carwiz

Windows 7 Pro-x64
 
 

Check for dirty contacts and be sure both modules are the same make, type and speed. A matched pair is essential.
My System SpecsSystem Spec
25 Feb 2014   #6
seven09

Windows 7
 
 

Hi, here is a screen shot of that. Thanks.

My System SpecsSystem Spec
25 Feb 2014   #7
seven09

Windows 7
 
 

Quote   Quote: Originally Posted by carwiz View Post
Check for dirty contacts and be sure both modules are the same make, type and speed. A matched pair is essential.
You know the contacts look messed up, as you can see here. The bios or computer can;t be booted when using this slot by tself, but the other can. I am definitely thinking it is bad contatcs, however ALL the 8gb of ram shows in bios and in total physical memory installed in windows, so I have no way to prove this is the cause

Open image in new window to zoom

these are pictures I took and sent to the retailer in hopes to get a refund for this mobo. My question is WHY has this not shown up in any diagnostic programs like memtest86 or windows memory diagnostic??

My System SpecsSystem Spec
25 Feb 2014   #8
Britton30
Microsoft MVP

Windows 7 Ultimate X64 SP1
 
 

Resource manager is no help, unfortunately.
What is the picture of? It does look like there are 6-7 solder lugs shorted.
My System SpecsSystem Spec
25 Feb 2014   #9
carwiz

Windows 7 Pro-x64
 
 

Oh yeah, that's toast. Looks like someone raked a screwdriver across it. A couple look like they're broken. Memory can be recognized but not functional. The BIOS just does a quick test.
My System SpecsSystem Spec
25 Feb 2014   #10
seven09

Windows 7
 
 

Quote   Quote: Originally Posted by carwiz View Post
Oh yeah, that's toast. Looks like someone raked a screwdriver across it. A couple look like they're broken. Memory can be recognized but not functional. The BIOS just does a quick test.
I know. brutal


But not 6 and a half passes with memtest86???

Quote   Quote: Originally Posted by Britton
What is the picture of? It does look like there are 6-7 solder lugs shorted.
That's half of the dimm slot contacts for the ddr3 memory
My System SpecsSystem Spec
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 Very strange memory problem 8gb installed 3.74gb usable




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