RAM is not showing up, is slot broken?

I have a macbook pro mid 2009 running Lion (upgraded twice). Right now, there are two sticks of 4gb RAM in the computer, however, if I go to about this mac, system profiler, or activity moniter, they all show that I have only 4gb, while I should have 8 (photoshop is running slower than it should, so obviously one stick is not being used.)
After testing a few times, I have found:
The not functioning slot is the bottom slot, If I try to start up my computer with a stick of RAM in there only, my macs screen stays dark and beeps periodically along with the "sleep" light flashing. However, if I just use the top slot, my computer works fine.
I know its not the RAM sticks themselves because i've also tested with 1 and 2 gb ram, so I suspect my ram slot is broken somehow. It looks fine, the ram goes in and everything, but obviously something's wrong.
I ran hardware test and it said everything was fine, but still only showed 4 gb total ram and told me theres nothing in the other slot.
So is my RAM slot just disconnected or something/broken? Can it be fixed? thanks

My suggestion is to take it to Apple to get a quote for fixing the bottom slot.
It might cost a lot and they might suggest that they should change your logic board since it's built in.

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you could:
Just buy a good 2 x 2GB set $25 to test (or 8GB $50)
Play musical chairs and put swap DIMMs with Risers
And lastly swap A and B
FBDIMMs will _fail_ if they are subjected to heat stress and get above 70*C over years.
Amazon has some that never budge from 59-60*C look the same but better quality.
You can help with the heat with more air flow using SmcFanControl to boost the default to 800 rpm makes a difference, plus add other profiles before doing heat generating operations and have a fan profile for 1200 rpm as well (easier to keep cool and prevent getting hot)
A bad GPU fan can also mean more heat is building up.
Install Hardware or Temperature Monitor (HM you can set alerts if sensor hits a point, has to be set manually) iStatPro may (never used it).
PS can benefit from more RAM than even 16GB / an SSD boot drive, and an SSD on a PCIe controller for scratch.... if needed after you figure this out.
2x2GB FBDIMM DDR2 667MHz @ $25
http://www.amazon.com/BUFFERED-PC2-5300-FB-DIMM-APPLE-Memory/dp/B002ORUUAC/
http://www.datamemorysystems.com/apple-mac-pro-8-core-2-x-quad-core-intel-xeon-3 -0ghz-bto-2007-memory-upgrades/
http://www.datamemorysystems.com/apple-mac-pro-8-core-2-x-quad-core-intel-xeon-2 -8ghz-ma970ll/a-early-2008-memory-upgrades/
Mac Pro 8GB Kit
Komputerbay 8GB (2x 4GB) DDR2 667MHz ECC FB-DIMM 240 PIN
http://www.amazon.com/Komputerbay-PC2-5300F-Buffered-FB-DIMM-Heatspreaders/dp/B0 05HIWD5U/
http://www.amazon.com/DDR2-800-PC2-6400-800MHz-Certified-MA970LLA/dp/B0085MGTEQ/
http://www.amazon.com/2008-PC2-6400-Buffered-FB-DIMM-MA970LL/dp/B007GB1I7K
Hardware Monitor
http://www.bresink.com/osx/HardwareMonitor.html
Temperature Monitor
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http://www.bresink.com/osx/HardwareMonitor.html
SMCFanControl 2.4+
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Message was edited by: Samsara

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despoina kiato wrote:
καμία φορά σταματάει να δουλεύει. σβήνει το κινητό και μου δηχνει το μήλο σπασμένο. απενεργοποιήτε μόνο του . αυτό είναι όλο .
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