The message is telling you there is a power problem or a short, of a component or the motherboard it`s self.
Or one has become loose or not fully seated in its socket.
Any card in a slot that is not flush or fully inserted.
A constant beep relates to a power problem to a component connected into the board via it`s socket or slot. Or a non working device in worst cases.
Check if you have a graphics card in the pci-e slot of the board it is inserted flush and has not lifted on one side, or dropped, it should be level or parallel with the slot.
If not unscrew level it up.
Use the same process for ram sticks in there slot and you will find the problem.
At the very worst the connectors of the board have taken the damage.
Like the Pci-e slot or the memory dimm slots.
In the case of the memory stick, removal of the suspected one hit, may allow the computer to work again. If it does it was the cause.
A new board will be required if the above does not work to fix the problem, I am sorry to say as the damage will be to the actual socket of the board.