My mother board has One long beep and 3 short beeps and monitor cant detect computer (Worked earlier)

[darkbird132]

While playing games earlier today my monitor black screened and I restarted it still didn't work but the one long beep and 3 short beeps appeared I need help I tried putting my graphics card in and out but still didn't work.

 

[vesp3r]

Dont know your MOBO so ill just let you look for yourself http://www.computerhope.com/beep.htm