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When the power is returned after a power outage it can cause a power surge and damage electronic equipment such as a computer. This is a reason to install a surge protection power board and connect your computer equipment to a surge protection board. The switch mode power supply may be faulty and replacing it may get your computer operating again. If you cannot DIY then ask a friend or take it to a computer repair shop.
check in your monitor menu to ensure there is no energy save mode set. press the menu button on your monitor and check the settings. ensure that your pc also does not have an energy save setting set. e.g if the mouse or keyboard are not touched for a specific time e.g. 1 minute then switch off monitor to save power. make sure that such settings are not switched to on in your pc settings. if this is a new monitor and this was not a problem with your old monitor then suspect the monitor settings if the monitor and pc are both new. then suspect both settings. if possible test the monitor on a second pc or laptop to see if problem persists.
I am having the same problem . The system is starting up and th epc entering power save mode. I have a Hp pavilion f1503 model monitor. I hit the power off button on the power surge to shut the entire power off. I turn the power surge button back on. Sometimes it works. Or have to hit the power on button to reboot.