What does 3 beeps mean?

WuYong

Honorable
Dec 8, 2013
2
0
10,510
I just built my first computer everything is plugged in except the power led and the usb 3.0 header but when I turn on my computer I get 1 long and 2 short beeps I've already tried removing my graphics card and same thing happens could there be anything else causing this? Oh and my motherboard is a asus m5a78l-m lx plus matx am3+