Must unplug/replug monitor to work

Yesterday received 23" monitor back from Apple Repair and and
new power brick from CA. Everything works fine and seems totally
reliable. But it took 3 months for the first power supply to fail.

Decided not to avoid using certain features in the hopes that it will
extend useful life. So I do use both the USB and firewire ports as is
normal. And I will power it on/off just as I would any other monitor.

If it fails again, I hope to avoid the pain of sending the actual
monitor back to repair and just request a replacement power supply.

so, what did the answer to the issue end up being? I just posted a similar issue while running two 23" cinema HD Displays. Any help would be greatly appreciated.

Well, well! So here's my fix: not expensive, not having to go to the Apple store, not having to spend countless minutes waiting for Apple Care to answer the phone etc. etc. I am running "2" 23" HD Cinema Displays and haven't had any issues in a month and didn't replace or complain about the screen not displaying and displaying intermittently. Simply... I touch the power button on the side of the monitors to turn them on and turn them off after each session. Could that be why that "button" is there??? Could all this be that simple??? I don't know but I haven't had any issues what so-ever! Very happy, I also color synced the "Pink" monitor and it seems to be matched and holding. Suffice it to say... the power button is my savour for now.

This is just a guess, still trying to track down this issue.

Assuming all of the many many displays being reported here are U.S. models - are any of you guys having these issues in a 220 V country as well ?

Or are all posters here on 110 U.S. volts ?

Yes- I'm a UK user who suffered all of the classic symptoms. Returned power brick and had it replaced under warranty. No problems since- now use it with firewire disconnected and monitor switched off when not in use.

Edward, thanks. Guess the 110 / 220 V theory would've been too plain simple ...