My Alienware M14X R2 laptop does a single beep continuously until i power it off by holding power button.
An year and half ago this problem started, it used to do the single beeps, I used to disconnect the power and start it. It used to start after a few tries. I did not use it for an year then, now it just does the single beep continuously. If anyone is aware about this issue and a potential solution please share.
Run the diagnostics to test the hardware. You should explain more about a problem you have lived with for a year and a half.