Well usually incompatible RAM doesnt neccesarily make the mobo beep but its possible but it might be worth checking with ASRock.
The ASRock website says the board only supports a 1.5V card so check yours is infact a 1.5V card!
Push down FIRMLY but not hard on all expansion cards, cables and RAM to make sure theyre connected properly.
If its anything to do with the CPU it might be as simple as chip creep- pull the heatsink off the CPU and double check its inserted properly and make sure you reapply the thermal paste/pad with new stuff! (very thin layer)
And it might worth your while to check the net for beep codes or just email ASRock for them!