This turned out to be a simple fix. Everytime i used to unplug the power from my laptop, oracle applications (11i, R12) both used to act abnormally. if you clicked on a Form or a menu or Function, the refresh was not correct. It was as if you didn't even perform the action. If you did an ALT-TAB and switch back and forth from another application to Oracle Apps, it would then refresh. I struggled and thought may be it was something to do with the Power Settings etc.. But no, it just turned out to be the Refresh Rate of the monitor/laptop screen. Just make it to 60Hz and you will be all set without any issues.
Control Panel\Appearance and Personalization\Display\Screen Resolution
Click on Advanced Settings > Monitor
Change the Screen Refresh Rate to 60Hz instead of default 40 Hz.