问:785g + X3 435 + 4870 + 2gt +战斧500。很难启动机常。After the Power key, the fan, CPU fan and hard disk have response, but the display is not input.If you turn off the machine and start again for more than ten seconds, you may be able to start the machine normally.This is the case when using both the set display and the use of the independent graphics card.In the process of using the irregular black screen, the keyboard does not respond; sometimes the picture will be stuck, the mouse and the keyboard have no response.Several official BIOS, motherboards and graphics cards have been reinstalled and unsolved.There is no replaceable main board and power supply on the hand.