Since you havent mentioned the operating system u are using .You can change the standby time manually to which you want . As of now turn on ur machine and change the settings .There will be no need to enter bios settings
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Standby is like the monitor powers off. You want to select the option for spindown disk when possible, and select hibernate. That is probably what you are looking for. Also check in the BIOS for additional power settings.
If you computer is going into hibernation, the best thing to do is disable it. These days it is better for the pc to stay on for updates and scans. Right click on an empty area on the desktop, click properties, click screensaver, click power set turn off hard discs, standby and hibernate to never, I usualy turn monitors off after 30 min seth
In the control panel, go to performance and maintenance then click power options. Or, right click the desktop and select the screen saver tab, then click the power button. If the hibernate tab is missing, either your hardware does not support standby/hibernation mode, or it is disabled in the BIOS. If the hibernate tab is available, click Enable hibernation to do you know what.
I think this is more of a problem on your computer instead of the monitor, ofcourse you could try another monitor and see if the same happens. I suspect your computer goes into standby or hibernation on its own, and it does work fine if you reset the computer right?
if you go into power management again, disable or turn off hibernation completely, its on one of the pages.
Make sure its not set to standby, and also disable your screen saver.
Right click on desktop - properties - then screensaver. turn it to none.
Also you could look into the computer bios and make sure its not set to standby or hibernation from there. thats unlikely but you could check.
how to get into bios.. depends on the computer, right when you turn it on, on one of the corners of the screen you will get a message, press button to enter setup or bios. press that to enter bios when its presented.
right click on your desk top then left click on 'properties' in the white box that appears.
this will bring up a 'display properties' box which should have a tab headed 'screen saver' amongst others.
select the screen saver tab.
in this tab there are 2 sections. one to select which screen saver you want to use (and what settings are applied to it), and another section which should be called 'monitor power'.
click the button here which says 'power...' to adjust your power settings.
in the next window there are 4 tabs. select the first tab (power schemes - which should be already selected by default) and you now have 4 options. leave the selected 'power scheme' in the top of the window as it is and just alter the settings for the selected power scheme.
your 4 options are: 'turn off monitor', 'turn off hard disks', 'system standby' and 'system hibernates' i would recommend setting all of these to 'never', and don't forget to click the 'apply' button after you've done this.
i would also recommend disableing hibernation in the 'hibernate' tab (this is in the same window as the power schemes tab).
once you've adjusted your power settings, don't forget to activate one of your screen savers. this is only important if you leave the monitor on for a long time with no changes taking place in terms of what is being displayed. if you leave a static image on for hours you will end up with permanent screen burn. (a ghost image that is always there - even when the monitor isn't switched on!).
i don't bother with screen savers personally as i find them annoying, and find it much easier to simply turn the monitor off whenever i'm not going to be using it for the next hour or more.
hope that solved your problem. apologies if it doesn't.
by the way, the tabs etc i described are what i have on my OS (windows XP pro) and may be named differently if you're using a different version of windows. the 'power options' settings will still be accessible via 'screen saver' tab in desktop properties though.
could be all manner of things, from just the graphics card, to the PSU or even the CPU, itself,
I would start trying to test the graphics card (may just need reseating)
and then test the PSU, then take it from there