Don't know what's wrong. The memory card should've been compatible but now even with just the original cards it won't start up or get past the white screen. it shuts back down.
iMac (21.5-inch Late 2009), Mac OS X (10.7.3)
Exactly what RAM did you install, include the manufacturer and exact specifications. If you put the old RAM back in does the comuter start normally, if so then your RAM is either installed incorrectly, is the wrong RAM or is defective.
I put the old ram back in same slot, plug it in, turn it on and it tries to restart but then shuts down. It was a PNY 4gb DDR3 sdRAM
Did you firmly push in all the RAM so that it clicks into place? What is the full specifications on the PNY RAM you bought, you haven't provided that information.
Pushed in RAM - never did hear a click but it won't budge to me indicating its in as far as it can go.
This is what is on the package: PNY 4GB DDR3 PC3-1066 compatible with 1333 MHz 1066MHz Mac compatible
The screen I get when trying to reboot is grey with apple logo and progress bar that gets a 1/4 way filled and I hear a click and shuts down. Doing a soft boot gives me a list of actions, then it shuts down midway thru.
Macs are picky about the type of RAM they need.
Strongly suggest returning the PNY RAM and get your money back.
Correct and reliable Mac RAM can be purchased from online Mac RAM sources Crucial memory or OWC (macsales.com).
I tried adding more memory to late 2009 iMac but now it won't start up! Any suggestions.
