After the system is shut down and power is put off and when the system powered through UPS, the system starts with out operating the front pane ON?OFF switch. The switch is tested and it is not shorted.
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hey dude your problem is so simple..below are my solutions.
if you already secured the fans for the replacement then its easy for you to do it, try to totally shut down your UPS removing the input and battery supply. avoid replacing the fans with power, its to dangerous. it consist of almost 400VDC inside in it.
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2 scenarios will either play out at the end of the day:
1. During power outage, your UPS will continue to supply backup power for the number of minutes.it is built/designed to do for your PC after which it shuts down and your PC due to lack of power shuts down too.
2. if you've programmed your PC to shut down after say a short period it idles, your PC will shut down even though your UPS is still fully operational.
A third approach is to sync the situation/scenario you envisage by powering off your UPS power supply at the mains/wall receptacle.
Watch what happens next by leaving your PC idle but still connected to the UPS still powered on (but without the mains power supply to it)
I'm guessing that during the power outage, the ups battery completely discharged. Now it will take about 14-15hrs to recharge it.It will not support any devices until it is fully charged. Remove all load devices and let the battery restore to full charge before re-connecting the devices. If the battery does not recover, it needs to be replaced.
The UPS has a fauly/problem.
If your UPS is approx. 600VA, then it is not a true UPS unit but a switch over type. When the mains power fails the UPS switches over to the battery and inverter in milli-secs to provide mains power.
If you turn off the mains supply and shut down your UPS, but you are still getting mains power, then there is a fault with the switch over circuit.
You need to get this unit serviced.
when the power cut off windows shut down immedeiatly and when u start your system wont boot this mainly because corruption windows files if its abruptly shuts down the current windows will get corrupted so better use an UPS for a standby atleast for few minutes so that u can properly shut down your system so that to prevent your corruption or your system files.This may help u.
you can program your power bottom to hibernate, and connect the screen direct without the UPS, so you get more time...then when the electricity goes off, without seeing the screen just push the power bottom to hibernate.
Try to separate the power cord of your monitor from your system or maybe if your using UPS(uninterrupted power supply) directly plug the UPS to the wall outlet. either you can use pretty voltage regulator to the regulate the AC power. if not solve the problem try to examine the your system power supply.