Problems with connecting Xbox with monitor

Hi! i bought recently Xbox One and now I need to connect it to my monitor philips 227el. At first I was using HDMI – DVI but it didn't have sound, then I bought HDMI – VGA and separate output for sound, but now monitor shows message that there is no video signal. After many many attempts it finally showed picture for 10 seconds and then again no signal. Please advise.
