Power Brick humming
44045
Why do some AC adapters and power supplies generate a whining noise, and what can I do about it?
131004
Watts P.M.P.O. and audio equipment power
31952
Regulated AC power supply?
143413
How can one correct intensity flicker due to AC line frequency?
72609
Testing a UPS by unplugging it from the wall
13532
Effect of Prolonged Vibration on Mechanical Hard Drive
31468
How can I force an internal hard drive to power on or off when I want?
155954
What is the cause of interference noises in my PC speakers and how can I get rid of them?
103404
Why PC reboots when there’s a power failure even with UPS?
156750
What does the indicator icon with three dots over a power plug mean in Ubuntu 20.04?
123978
Why is this power adapter transformerless?
91384
There appears to be a poltergeist in my speakers (no, really)
77617
Western Digital drive making beeping noise
148145
My circuit doesn't respond properly to the duty cycle
46143
Test a wooden board's vibration mode
98293
HDD light pulsing every few seconds under Kubuntu 18.04.3 (re-post)
97977
laptop noisy sound - fan or hdd?