入唔到bios

今日開機果陣,電腦淨係嗶左一下,然後就自動斷電。但之後又自動重啟同斷電,keyboard同mouse既led燈都有著,會係咩問題?
Spec:
i5-4440
Toshiba 2tb
Asrock b85m pro4
silverstone essential 500w
Inno3d i-chill gtx670 4gb
Kingston ddr3 4*4gb