I tried the internal and external power buttons. here are the specs for my system.
DVD Drive: ASUS DRW-24B1ST/BLK/B/AS Black
Hard Drive: Seagate Barracuda ST31000524AS 1TB 7200 RPM ...
CPU: Intel Core i3-2120 Sandy Bridge 3.3GHz LGA 1155
PSU: SeaSonic M12II 520 Bronze 520W ATX12V
VGA: XFX Double D FX-787A-CDFC Radeon HD 7870
MOBO: ASRock Z77 Extreme4
Case: Raidmax Tornado ATX-238WU
DVD Drive: ASUS DRW-24B1ST/BLK/B/AS Black
Hard Drive: Seagate Barracuda ST31000524AS 1TB 7200 RPM ...
CPU: Intel Core i3-2120 Sandy Bridge 3.3GHz LGA 1155
PSU: SeaSonic M12II 520 Bronze 520W ATX12V
VGA: XFX Double D FX-787A-CDFC Radeon HD 7870
MOBO: ASRock Z77 Extreme4
Case: Raidmax Tornado ATX-238WU