how to fix a thunderbolt display goes dark won't wakeup?

Hi, I had this issue for a while with one of my thunderbolt displays, tried many options, non worked, until I found out that the power source is the problem (as in power fluctuation in the current), so use a very good "smart surge protection power board" or MagSafe or USB-C power adapter, that will solve the problem.

These are the options I tried but did not worked:

Reset Mac's SMC: On the Mac's built-in keyboard, press the left side Shift-Control-Option keys and the power button simultaneously.

Release all the keys and the power button at the same time.

Press the power button to turn on the Mac.

Reset Mac's NVRAM or PRAM: Shut down the Mac. Turn on the Mac.

Press and hold the Command-Option-P-R keys immediately after you hear the startup sound. Hold these keys until the Mac restarts and you hear the startup sound for a second time. Release the keys.

Use a Standalone Thunderbolt Cable

Update thunderbolt firmware

But simply a reliable power supply fixed the problem!!!

Same with the mouse, you have to use a "full alkaline battery" otherwise if the voltage falls below1.5v the Bluetooth would discount intermediately.