CHECK 1: Remove power connection, remove battery, replace battery and try again. Might fix your problem by now. IF NOT FIXED YET: If it tries to turn on but keeps cycling in 3-10 second reboot intervals, turns on for 3 seconds then reboots and does it over and over again. 'CHECK 1' again then. 'CHECK 2'. CHECK 2: As you hit the power button, after having done 'CHECK 1', hit escape a couple times this should force a boot under any condition.