After upgrade to Lion, MBP won't recognize 8GB RAM

[MarlboroLite]

So I upgraded to Lion and all of a sudden both in About this Mac and in Activity Monitor it's showing that I have 4GB of RAM even thought I have 8GB installed and was recognized under Snow Leopard.

I tried resetting the PRAM and nothing changed.

Any help would be appreciated.

 

[ljonesj]

shut the mac down and try resetting the ram in the computer to see if it may have come lose if not do a mem test 1 stick may have failed

 

[Haves]

Having the exact same problem after upgrading to Lion last week.

I replaced what I suspected was simply a bad 4 GB RAM stick, but Bank 1 still showed as "Empty" in the System Info even with the new RAM. I then switched the RAM sticks just to verify, and the system recognized both sticks again for a full 8 GB of memory.

Then, over the weekend my MBP restarted, and now I'm back to 4 GB.

Really hoping that it's a Lion issue so that I don't have to replace the memory bank hardware?

____
MBP | 17" mid-2009 | 2.8Ghz Core 2 Duo | 8 GB RAM

 

[applebookpro]

Same Issue

I'm also suffering from this issue. My lower ram slot is not working after Lion so I'm down to 4GB.

System Profiler describes the slot as "empty".

_____
15" MBP | Late 2008 | 2.4GHz | 8GB RAM

 

[Aprioribox]

Has anyone here had this problem solved? Happened to me this weekend after Lion update. Reset the ram, replaced it with another set, ran the hardware test and nothing. Looks like a Lion issue. Any luck?

 

[xRaRFx]

Bump!

I'm having the exact same problem right now, did someone found a solution yet?

 

[heisenberg123]

MemTest