i have acer aspire 5570z sometime i m facing problem with during start up after power on cpu light is on fan also started but nothing is coming on display and after 15-30 min it is getting normal start up. And sometimes it is getting normal start up but message is coming that OPERATION SYSTEM NOT FOUND. and sometimes windows also starting normally but after windows hanged and sometime window also crashed i replaced my hard disk also but still problem exist. anybody can help me about this. i m confused
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