Well it started with an average picture, nothing to worry about. The noise of the power adapter was only noticeable in sleep mode. The seller asked for a video of the problem confirming the sound in the video. (And here others had the same problem.) However, he was only willing to replace the power supply.
Sceptre C325B-144R: Advanced FreeSync HD Display with Wall Mounting and Tilt Adjustment
94 Review
Dell E2318Hx LED Lit Monitor: High-Definition Display with Flicker-Free Technology and IPS Panel
109 Review
Samsung Flat Monitor Super Slim Design 27", 1920X1080P, 75Hz, Flicker Free
112 Review
Dell SE2416HX Screen LED Lit Monitor 23.8", 1920X1080P, HDMI
93 Review
๐ป Get Amazing Video Quality with Logitech HD Pro Webcam C920 (Discontinued Edition)
83 Review
Apple AirPods Pro MagSafe RU Wireless Headphones, White
159 Review
50AA2500 EBL Individual Battery Charging System - Rechargeable Batteries
56 Review
Enhance Your Visual Experience with Logitech C260 Webcam
78 Review