Hp dv6500 turns on and off repeatedly​, any solutions?

Question

Hi, I got an hp Pavilion dv6500 laptop for christmas around 2007 or 2008 and its having some problems. My brother was using it in March and he said the screen turned a bunch of different colors and froze. He started it back up and it would turn off after a second or two, then turn itself back on and off over and over. I have tried the following to fix the problem:
1. Reseat the memory, unplug and take out the battery and hold down the power button for about 30 seconds, then power back on.
2. Take out the BIOS battery and put back in (which I read is supposed to reset the BIOS) and place back in after 5 mins (I tried leaving it out for 5 to 20 minutes)
3. Reseat memory, place in freezer, take out after 3 hours, let it get to room temperature, turn on, update BIOS and Nvidia driver, (mine didnt even boot normally)
     I have only had succes with #2 above. At first once I would do this, it would boot normally for a while and then start the power cycling again, I tried #3, but that didn't work, but then I took out the BIOS battery for 6 mins and put back in, it would turn on then make a noise and then I would hear the CD player noise and it would make the noise over and over... I found this was because I didnt reseat the memory all the way, so once it was back in all the way, it started normally (also because i reseated the BIOS battery).
     When it came on normally it had an option to start normally or to run a check thing, last time i got it to boot it turned off before the check could finish, so I decided to try and update the BIOS as soon as I could, so I updated the BIOS, then after it flashed it, it shut-down like it said it would do, then when I powered back on, it started power cycling again...so i reseated the BIOS battery....We have done a bunch of the updates that the HP health check thing found but it hasnt fixed it...I also updated the "NVIDIA GeForce Series Video Driver"..which didnt fix it either.
- In the past the laptop would get so hot, if it were any more hot it would of burnt me, so i would turn it off, most of the time it would turn off by itself when it was too hot. BUT after a while it started to turn off by itself when it wasnt hot. Now ever since I updated the BIOS, once I take out the BIOS battery and place back in after 5 mins, it boots normally and every thing seems to be very normal until I power it off.
Is there any way to fix this? What is causing this? I would really like an HP employee to respond if possible too since you guys might know more about this. I have read other posts where people have asked HP employees to respond but nothing, so please do me a kind favor and help me and the many other people that have this problem. Thanks.

Answer 1

cybris wrote:
Thanks for responding so fast! And I was hoping to get a different answer than the motherboard needs to be replaced, since I have read tutorials on fixing it where people were told to do the same but they did something else ( freezer trick) and theirs works fine now....Also, if the mother board might need to be replaced, then why does it work fine once I reseat the BIOS battery? Any other solutions/suggestions?
I'm not sure, it may be that you let the system cool off and sit without power for awhile.  It's not easy to explain an intermittent issue.  Have you already ran an HP System Recovery which formats the system and sets it back to the original settings?