Monitor worked fine for years, then permanent standby

Click on: Control Panel, then click on Hardware & Sound, then click: Change When Computer Sleeps, then select the time setting you require in:"Turn Off The Display."

A Google search indicates this is a common problem.. Some of the comments in this video may help. If it is still under warranty, you might be best to get a RMA. Good Luck.
How to fix Samsung monitor that is stuck in sleep standby mode Temporarily

I’m happy to help further over the phone at https://www.6ya.com/expert/steve_52488d61fac93877

In regards to your issue with your monitor: For a monitor to display "no signal input" there is likely a problem with the monitor making a connection to your input source (yes I know duh). First and easiest thing to fix this is to check your cables going between your computer and monitor, if your computer and monitor start out working and then fail to communicate, there is a good chance that the cable might be coming loose just enough that the connection fails. I might suggest that if you have, as you say another computer, that you try swapping monitors to check where the problem lies.

Hope this helps some.

goguyted is true

Since you have tried another monitor with your computer, then we can only assume that your LCD monitor had gone bad.
If the light is green but you can't see anything on the screen, then most likely the backlight has gone bad. Unless you want to take the monitor apart, I would suggest buying a new monitor.

Its going to sleep mode after 5 mins or going to standby if you are not working on it. you can on it by moving mouse or pressing any key on keyboard if it gone to sleep mode .You can press power button to make it on if its gone to standby. To disable this Right click on any empty space on desktop and go to screen saver tab and click on Power button . There in Power Scheme tab , make all options to NEVER and press Apply and OK.Now it will work fine. Options are turnoff monitor, turn off hard disk , System standby , system hibernates etc

This is a classic VP930 problem.

It is caused by bad capacitors in the power supply circuit.

Open the monitor, and look at the power board. There are six capacitors. Replace the 220uF @ 25V and the 1000uF @ 16V capacitors. I would recommend replacing them with 35V and 25V capacitors respectively.

If the serial number on your monitor starts with Q8H you could also have a bad IC on the main board. Q8 on the main board is an FET in an IC package. If this problem persists solder a wire from the right side to the left side. There is one pin that turns the IC on and off. All the other pins (per side) are soldered together. Do not solder the pin on the left side that is by itself. Just leave it. Solder ALL the other pins on the left to ALL the other pins on the right.

Remember, do this ONLY if the problem persists after replacing the capacitors AND if your serial number starts with Q8H.

check your devices make sure no errors
control panel display scrennsaver hardware
set harddrive and monitor time to shutdown
set sleep or standby to never
then remove check from hibernate
also look in advance at top and check your settings

Hi,First there is no signal from the PC . check if the display card has come out while moving the monitor, or just reinsert the display card in the PC , then boot the pc .