When my monitor starts up or idles into hibernation mode, black screen and green power light blinking, it will not come out of it. It does this whether connected to a computer or not on powerup. The only setting on the computer that has been changed since this problem began is to disable the sleep mode. I also attempted to connect it to another working computer with the same type monitor as well with no change.
On random occasion, it will turn on when the video cable is disconnected and reconnected, but lately this has become so infrequent as to be undependable. At other times, when left unconnected from any source, it will go into a standby mode where the screen flashes solid colors in series. Once it does this, it will turn on when connected to the monitor cable. It does not often or reliably go into this mode either.
One last note: the computer it is primarily connected to works fine with several other monitors and this monitor has the same problem no matter what computer it is attatched to.
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Unplug everything from the tower. Including power cord.
Press the power button for 5 secs.
Proceed to connect, power line, mouse, keyboard and monitor
That should reset the power or hibernation mode that you might have issues.
If everything looks normal, proceed to connect your remaining devices.
You must be aware that having a BIOS settings to boot from USB, DVD or USB-FLOPPY might prevent to boot into windows.
If it EVER works, then the problem is not a failed part, but a weak part. The most likely component type to give you such problems are capacitors. But very few repair techs know how to find such problems, and even fewer have the equipment needed to find the bad one(s) in-circuit. The failure mode is high ESR (ESR means Equivalent Series Resistance). The lower the ESR, the better. Capacitors with high ESR cannot stabilize circuits which demand high pulse currents, such as in switch mode power supplies.
it is going into sleep mode, good luck with this.... i am currently asking how to get my hard drive to quite putting my monitor into sleep mode.
although it hasn't worked for me because my screen stays black, one of the options given to me is to try to start in safe mode and then adjust your settings to "never" on the energy/sleep/hibernate mode
some one else suggested that i remove and reseat the video card