As per the table Chris supplied, 6 beeps indicate a video card failure.   As for the SSD/HDD recovery process you experienced: If windows is not properly shut down, it will not reset the dirty volume bit on your HDD/SDD. Upon the next power up of the system, windows will check for this bit, and if it is there it will know the previous shut down was not successful. In that case it will run a disk check to verify the drive has no errors on it.   It looks like the video card issue might also have caused an improper shut down of the system.
Greetings! I'm Mosè from Venice. I've had a strange issue with my Alienware Area-51 R2 desktop. When I started it today it started a recovery process of the hard disk (which is actually a SSD): as I never had any problem, I pressed a key to skip it. The PC booted normally, but asked me to do a check of the disk to solved its problems. So I rebooted: but the PC did not reboot and started to beep instead (6 short beeps, repeated). I rebooted again and this time it started the recovery process: I let it go and it lasted just a few minutes. Then the PC restarted again on its own and now it seems to be perfectly working (I'm writing through it). But I am a bit worried. Should I? What has happened? Thank you! Mosè
Area-51 R2, 6 beeps and then starts recovering process