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Make sure the alternator is producing the rated amperage. One or two blown diodes inside the alternator will reduce its output. Test for a draw. You do this by taking off a battery cable and using a multimeter set to measure current connect it to the battery cable and then to the battery post. Now start removing one fuse at a time while observing the current draw until it stops. Whatever circuit that the fuse controlled is the problem.
Its actually really irritating. You have to turn off all the alarms i.e. so no little bell icons are showing in the display and also turn off the radio i.e it shows OFF. Then, and only then, if you hold down the SET button you will be taken to the time setting menu which starts with a blinking 12H sign. Once in this menu its like any clock radio - you push up or down on the right hand side to select higher or lower numbers and hit SET again to progress to the next feild. You must complete the entire setup menu i.e you must keep hitting SET until you are back at the main screen or it will just forget what you entered go back to whatever it was before you started. Very opaque if you dont have the manual, so I thought everyone else could get 45 minutes of their life back. BTW, the holding down SET with the iPOD in the dock doesnt work for me - its supposed to according to some entries on the web.
I'm not clear on some of the question. When you say "suddenly not working" , explain what you were doing? Is the Laptop overheating? Does the fan and vents need cleaning? Is it getting sufficient air flow from the bottom through the laptop? If you unplug, remove battery, leave battery out, plug in, try to reboot, post what happens. Fan spins? LED's blink? What's on the screen at boot? Post the OS you are using. Windows 7 32 or 64bit? Take a look at HP Support: http://h10025.www1.hp.com/ewfrf/wc/documentSubCategory?tmp_task=solveCategory&cc=us&dlc=en&lc=en&product=4308554
If your laptop appears to boot up and the hard disk LEDflashes, then the problem is probably a back light fault. This can be a faultyinverter or a faulty CCFL lamp. Please click on this link and follow myinstructions to identify the fault and possible fix :- http://www.fixya.com/support/r3598095-faulty_laptop_lcd_screen
IF THE RADIO STILL HAS SOUND ...BUT NO LED'S IT MAY BE YOUR MEMORY FUSE (YOU HAVE 2 FUSES )SOME TIMES THE MEMORY FUSE IS YOU ILLUMINATION FUSE .......CHECK THAT FIRST ..IF YOU HAVE NOT YET...OR MAYBE THE WIRE HAS NO POWER FROM WERE IT IS COMING FROM LIKE A FUSE UNDER THE DASH THAT FUSE MAY HAVE BLOWN USE A 12 VOLT TEST LIGHT..IT'S A START.................. GOOD LUCK
Try replacin a new display card. If it is fine working.ok
If not try fixing for cold solder in the video section.
I suggest video section according your report the light green LED lighted that shows the power section is doing fine.