Hello good day, i have an acer laptop that is

Hello good day, i have an acer laptop that is givving me some problems...when i put the power on, before the welcome screen the laptop gives 2 quick short beeps and then a continuous beeping which goes on and on......the screen is blank, the only thing there is the flashing unline icon " _ " and when i press any key on the keyboard it boots and ask me if i want to boot via safe mode or normal..when i click normal it boots properly....how do i solve the beeping problem