I missed the bit about the missing battery!
The 90w charger has arrived but unfortunately to the exact same outcome. Having a look on YouTube it seems similar models (named dv7 but not at all physically the same) might need the gpu reflowing or such. If that is the case I think I will give up. Not sure I have the patience to do that so might just stick it up on classifieds if anyone wants a spares project. It’s a 17.3” screen with metal/chrome body i5, bit of a shame but there you go. Thanks for all your help people!
Sad to hear that, but at least you can return it to Amazon, I guess that's where it came from.
It could well be that HP revised the spec to 120 W but didn't change the spec docs to reflect that and the 90W doesn't cope. The dv7-7065sf looks like it's the part number for the 120W version.
Here's a link to the 120 W version, not many sites supply them and sadly Amazon don't.
https://www.adapters-store.co.uk/hp-ac-adapters-c-4/hp-120w-adapter-charger-hp-pavilion-dv77064ea-dv77065sf-cord-p-94024.html
But understand your not wanting to go any further.
HP normally revise their service manuals and website to reflect any changes for the models.
I suspect that there is something more fundamentally wrong as the higher spec power supply is generally needed to charge the battery and run the machine at full capacity.As a result they will often work with the next one down albeit Windows will give you a warning message about charging.
Not sure where are located but I have various hp chargers including a 230w which powers pretty much everything.
As you say normally
As for the battery @spideypunkisn't using one as the old one was not good so the 90w isn't charging anything. But it could still be insufficient.
No it would boot on a 90w and at least let you get to the bios.90 (or 120w) is the max supply and there is usually a bit of extra in there.It's as it ramps up the CPU and GPU you would run into issues with stability.
As I emphasised "could" still be insufficient, and yes there should be enough power in the 90w but I guess we are only second guessing. I suspect damage has been done using the wrong PSU but again that's another assumption. In the cold light of day it looks as the @spideypunk is probably wasting his time, but you never know!
Laptops are designed to survive a certain amount of abuse, plugging an under powered psu won't damage it. Neither will an over powered one, it will draw the required current. This includes voltage variations which would include the one tried before.
Given the age it is highly likely to be one of the other common issues that the op has found.
lol you plug the wrong PSU, especially one that's over voltage, into anything chances are you cause damage, not to mention what polarity reversal would do.
The age of the product has nothing to do with it.
Sorry should have been more explicit in slight voltage variations (we are at less than 5% between the two chargers) are countered for in design.
Polarity is the same in both chargers.
The age has everything to do with it, thermal kills laptops due to various things including soldering issues as the op identifies.Overtime this is an issue so age matters.Same issue gives you issues on ps3