In the motherboard there is a small green LED(Light). It is located in the middle bottom of the DH67BL if it is fixed inside a tower case. check if it is glowing when your computer is connected to the electricity before press the front ON button if not, Then it is mostly likely a power supply issue try to replace it .Sometimes the LED is on but the computer will not start up (mini ATX motherbord). This is also a power supply issue(rarely motherboards). If you see the intel booting screen send me an other email explaining exactly what you see at booting process.For gaphic card DH67BL has a wonderfull and pwerfull Full HD 1080 build-in graphic card wth Dual Sreen capability and to arroud 1.2 Gbit shared memory. All you need a good Full HD monitor.maybe two of them using HDMI socket.
Thanks for your valuable advice.
The motherboard LED and all fans including processor fans and DVD drive are working but the desktop is not booting.
Is nVIDIA GeForce GTS 450 Graphics card suitable for this desktop ?