Looks like the backlight is going on the LCD screen. The hissing sounds is probably a capacitor of some sort. Worth taking into your nearest HP service agent to see what needs repairing. Have a look at the Maintenance and Service Guide troubleshooting section: http://h20566.www2.hp.com/hpsc/doc/public/display?sp4ts.oid=5230510&docId=emr_na-c04076661&docLocale=en_US
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