After upgrading my MacBook Pro memory to 8GB it no longer boots to an operating system.

It is a MacBook Pro, mid June 2009 model and 13".
I've followed the installation videos adequately and the orginal 2 x 2GB have been removed with the new 2 x 4GB successfully slotted in.
It turns on and goes past the first Apple logo and the "ding", then lands on a light grey screen.
A black arrow is active but there is no menu bar, icons or anything showing. 
After a while the iTunes screen saver activates and I also noticed an alert from BusySync appear!
Looking for an Apple genius to help me sort this one out!

What I find interesting is this:
A black arrow is active but there is no menu bar, icons or anything showing.
After a while the iTunes screen saver activates and I also noticed an alert from BusySync appear!
That suggesting that the computer is booting up - no other way to see the cursor screen saver. It would be strange to see this occur with bad memory but when returning the original RAM led to the same thing...
I think it would be a good idea (start with whatever RAM you have installed now) to do a safe boot. Restart the computer holding the shift key until the grey Apple screen appears. Among other things this will force the system to perform a disk test and will erase cache files that sometimes cause problems. If the computer boots normally into Safe Mode you can then try booting normally again.

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