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Sometimes, specially when using beta ROM, things stuck up and you get BSOD (Black Screen Of Death). That is, nothing happens when you press any button or touch the screen. At such times the only solution is to take out the battery and replace it and the phone will start normally after powering up.

But pulling out the battery is cumbersome specially when youve used fancy case  to protect your phone.
To simulate battery removal or to restart the phone press and hold Power, Volume down and Trackpad button for 1, 2 seconds. The phone will restart and power up normally.

Please note that this is like restarting your computer by pressing the restart button. This causes unclean shutdown of the phone and may cause data loss. Hence, only use this method when you really have to, i.e. instead of pulling out the battery.