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I have a hp Pavillion dv4 lap top that will not boot up. When I turn it on, there is power, but it does seems like the hard drive engages. I replaced the hard drive; but that did not fix the problem. I opend the back took out the memory cards and network card and inspected and took them back in; still not working. Help!

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What you need to do is note the sequence that it goes through.
It should, when booting, flash the Caps Lock key and the hard drive lamp etc. When it has done that it has finished the POST as it is known, Power On Self Test. Then it should try and load from the hard drive after first going to the BIOS option. When it has finished that will then complete the boot sequence.
Try, if it gets as far as the Bios option, entering the Bios menu and set to default. If it doesn't make the Bios menu, there is a mother board fault and I cannot advise online about how to repair that.
Hope that gets you working again,

Posted on Nov 05, 2010

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The hp laptops house the fan at the buttom of the unit, for those of you who use their laptops on the bed or otherwise should understand just like us the laptop needs to breathe and if it cant pull the air to cool the unit it will overheat.....Also if ur accustomed using it on the bed or if u havent given it a proper service and by that i mean pulling it apart and cleaning the fans and heatsink then u should and that will definitely solve all problems.....

rajesh700@hotmail.com

Posted on May 24, 2012

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Its the motherboard.
HP made some bad choices in how they put together the dv and tx series laptops. Short version, these machines commonly cook their own motherboards due to inadequate cooling (i have one too, tx in my case).
if you are still under warranty you may be able to get this taken care of, otherwise you have a very good reason not to buy another HP notebook (this one is all done, sorry)

now if you really needed to get the machine to boot (like to salvage files from the hd) you can try these things
1 hold F10 while powering on

2 if step 1 doesn't work your laptop is now in the state I call "the lights are on but nobody is home" ie: the lights are on, the fans run, but no boot logo (hp splash screen) or bios post just a blank screen
3 take your laptop (still running as in step 2) and put it in a bag, or wrap it up in a towel or blanket.
now let it "preheat" for about 30 min.
4 power down your (now preheated) laptop do this by either holding the power button (or slider ) untill it is all the way off, or unplug and pop the battery
5 plug back in, replace battery and try booting. give it a couple tries and try holding F10 as well (i am probably just superstitious about the f10 thing but it can't hurt)
within the 1st 5 trys it should boot up.
bear in mind this is not a long term solution

Posted on Nov 05, 2010

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