My monitor on green light is blinking.. processor is on and am hearing music. And I know inside process are going well but my monitor doesn't display after xp boot screen.. but it displays output in safe mode.. in normal mode monitor displays up to boot screen until that green light is constantly on after that green light blinking

Check your BIOS monitor power settings, if any. Check the power settings in Windows. Check your screen saver settings.

Usually it means your sleepng or hibernating, or not getting a signal from the card so check connections.