Hi [NAME] welcome to this free user to user Alienware laptop discussion forum.  Error Code 2000-0511 (Processor Fan), and/or 511 CPU Fan not detected Error During Boot.  Error code 511 and the horrible beeping sound are saying the fan has a fault and should be replaced.  If you are not happy to replace the fans, the following is for information should you decide to get professional assistance.  Alienware Area-51m R2 laptop is getting old and moving parts will be reaching their end of life. The prospect that both fans should be replaced should be anticipated.  Dell support for Alienware Area-51m R2 includes Removing the heat-sink assembly. and this is similar to Removing the Alienware Area-51m (R1) heat-sink assembly as shown in the following video, to give access to the fans.    Single or matched pair of OEM replacement fans are available, CPU & GPU Cooling Fan for DELL Alienware Area‑51m R2 DP/N TPV77 TW5Y8.  [IMAGE] 
Upon turning on my Area-51m R2 I it does a system check before proceeding to throw up an error code 511, provide a code to scan, and make a horrible beeping sound. This happens every startup. I can press esc to proceed as normal for now but obviously something needs doing. I've completed the two suggestions on the dell website:      1. inspected the laptop for clogged or obstructed air vents - they are clean and unobstructed      2. update the BIOS - BIOS is up to date. What else can I do?
Area-51m R2, error 511 on boot