How to get rid of A2 error on ASUS maximus vii lcd screen

GSUS

Reputable
Aug 16, 2014
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I'm new at computer building I've made a build that at first successful booted. It said ASUS republic of gamers etc. However it said unable to detect keyboard so I turned it off and I went to the store to buy a new keyboard because I didn't have any laying around. I came back to my computer but when I tried to boot it nothing showed up on my monitor and on the lcd screen on the motherboard [ASUS maximus vii] is says A2 and no method I've solved this problem with has worked I've taken out the drives then it says 99 and still nothing will show up please help me out I'm so confused.