Go to the link http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?product=3752689&lc=en&cc=us&dlc=en&lang=en&cc=us&submit=Go%20%BB , and select your operating system.now in the following window look for BIOS and under BIOS click on Winflash for HP notebooks.now in the following window click on sp45070.exe and after that you will get a box here click on run.now just follow the onscreen wizard and click on options like next and continue.once the process is complete your system will automatically shut down.just turn on the system and it should work fine after that.
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