i have an offline ups but when power goes out my computer keeps on restarting and never goes beyond the booting screen what could be the problem.earlier it used to work fine.
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batteries gone.. replace it and do chk ur sys without UPS as told by Deep..
Also chk ur Power Supply cos this may b happ due to constant voltage fluctuations which must hv spoiled ur batt.. unless and until it is rectified u cant use UPS even if u replace it..
i had similar problem.maybe ur battery is not charging up even if mains is on.u first hav to check the circuitry with a technician an then think abt a new battery.