Memory "lost" on wake up

Hi,

HW: Macbook Pro early 2010

Since a few weeks my Macbook Pro behaves a bit strange: It boots normally and both of my 2 2GB RAMs show up in "About this Mac" - I see 4GB. When I put the laptop in sleep mode and open it up again, the laptop occasionally doesn't come up again - the display stays black. When I press the power button for some time, the laptop comes back again but from hibernate mode. If I then open up "About this Mac" I just see 2GB. If I reboot, I either get 4 or 2GB - depending on the "mood" of the laptop. My question is: What can be the reason and how can I solve this?

Thanks in advance
Jochen

 

Hi ljonesj,

actually the problem first appeared with the original Apple RAM. I thought it would be an issue with the RAM and replaced it with 2x4GB chips, but the problem persisted. Then I removed one of the 4GB chips and since then the problem did not appear any longer. So it really seems to be a HW issue or? I will nevertheless try the pram reset...