CPU upgrade problem

Hi all,
I have just upgraded my toshiba a500-1gl from I3-330m to i7-840qm and 4gb to 8gb ram. Everything works fine computer boots low temps but the following have happened.

Screen brightness control is disappeared
Computer wakes up from sleep but no display or responsive
This model comes with touch button for multimedia and there is a light under them, no light any more
Toshiba also comes equipped with Eco utility, every time Eco is turned on, utility crashes

When in bios, brightness can be changed using hot key and light also comes on. But as the computer boots in os, light gets turned off and brightness is stuck.

Please help if you have any idea why that might be. I have also tried using different operating system (win 7 ultimate 64bit) but same thing.

Thanks