This will be obvious but just saying:
Make SURE the RAM is seated correctly (inserted all the way and sitting straight.) After you double check reboot your computer and see if it will recognize your new RAM. If not, you may need to reset the NVRAM. NVRAM is storage on your motherboard (not your harddrive) that stores data such as: Speaker volume, screen resolution, startup disk, kernel panic info, etc...
To reset the NVRAM follow these steps:
- Shut down your Mac.
- Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
- Turn on the computer.
- Press and hold the Command-Option-P-R keys before the gray screen appears.
- Hold the keys down until the computer restarts and you hear the startup sound for the second time.
- Release the keys.
After resetting NVRAM or PRAM, you may need to reconfigure your settings for speaker volume, screen resolution, startup disk selection, time zone information.
Did you buy the 8GB of RAM with the proper speed rating? I noticed in one of your photos the new memory was listed at 1333MHz. I also noticed installing the old memory it was rated at 1066MHz. My MPB early 2008 requires 667MHz memory.
Sugesst you go to OWC at macsales.com and verify the correct memory required for your machine.