my 8470p will not power up tried hard power reset no help

[Charlie1973]

I tried different battery,no help and I removed the battery and plugged in it worked the first time ,now nothing

[WAWood]

@Charlie1973 

ost likely, the PC is experiencing a major hardware failure. You MIGHT be able to run hardware diagnostics by pressing the Esc key repeatedly and then, when the HP Startup Menu appears, select Diagnostics (usually F2) and let it run.

If that does not work, then there is nothing more you can do by yourself -- and there is nothing we can do because we HERE have no way of diagnosing or repairing hardware problems.

You will need to have the PC physically examined in a service facility by folks that can run their own diagnostics to determine what is wrong with it.

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If your PC is still under the original one-year HP warranty, or if you have purchased an extended warranty from HP and this is still valid, then having HP do this is an inexpensive option for you. In that case, you should contact HP Customer Support to see about having it repaired or replaced under warranty.

If you live in the US or Canada, contact information is on this page: http://www8.hp.com/us/en/contact-hp/phone-assist.html#section1

If you live elsewhere, contact information is on this page: http://www8.hp.com/us/en/contact-hp/ww-contact-us.html

NOTE: After you get through, stay on the line until you are finally able to talk to some one -- it can take a while!
If you have trouble finding a phone number, then try: 1 (650) 857-1501.
Tech Support's number is 1 (800) 474-6836.

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If your PC is no longer under warranty, then it will cost you up front to have HP examine your PC. If you want to do that, you will have to contact an HP Repair or Service Center to see if they can examine the PC to determine the cause(s) of the problems, if it can be repaired, and an estimate of the repair costs.

If you live in the U.S., here is a link to the HP Service Repair Centers:
https://www.service-center-locator.com/hp-hewlett-packard/hp-hewlett-packard-service-center.htm

If you live outside the U.S., here is a link to HP Service Centers, by Country/Region: https://support.hp.com/in-en/service-center

Good Luck

[Charlie1973]

When I say it won't power up I'm saying .I have power out of the power cord but not powering up to even get to boot.

 I purchased a new battery and it worked for a short while.Then that one stopped I was able to run off the power cord for a couple of days,now nothing.

  I had the back cover off to trouble shoot,but found nothing out of place.

Is there a safety button or switch if the cover is removed to power up