Solved! Black screen with loud buzzing

Oct 11, 2018
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Hello,

I recently purchased an Alienware 13r3 refurbished from Dell outlet. After receiving it and playing a few games, I decided to undervolt the CPU to lower temps. I settled on -100 and everything seemed fine a d I dropped CPU and GPU temps 7-8 degrees Celsius. A few days ago, I pushed the undervolt to -120 and did a short (10 min.) stress test in XTU. It passed and I downloaded some things then shutdown for the night. The next day, I went to play guild wars 2, and about 30-40 minutes in, I got a black screen with a loud buzzing sound. I manually powered the system down and restarted. I clicked into XTU and received a message if I had watchdog enabled, values would be reset to default settings for stability, or something to that affect. I readjusted the value back to -100 and played about an hour with no issue. Was the black screen and buzzing caused by the -120 undervolt? Or should I be concerned about something else? I am within the return period. Love the computer and that's the first time anything like that happened. I am assuming the undervolt caused instability (guild wars 2 is more CPU intensive than gpu). However, I wanted the opinions of others before I assume it was only the undervolt.

My system:

Alienware 13 r3
13.3" Oled display
kaby lake i7 7700hq
Gtx 1060 6gb vram
8 gigs ddr4 ram (hynix)
256 gb pcie nvme sad (Samsung)

Without undervolt:
GPU temp, 88c max, 74c average
CPU temp, 90c max, 76c average

With undervolt:
GPU temp, 80c max, 67c average
CPU temp, 84c max, 69c average

*Temps gaming (guild wars 2) for one hour for comparison. HWINFO64 used to monitor*

Thanks in advance!
 
Solution
Likely the undervolt caused it. You can check Windows Event Viewer for clues. That's fairly common behavior when the core voltage is reduced too much.

There's no way for us to know for certain, of course. It's just an educated guess.