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Try just the power supply fromt he wall to the laptop without the battery inserted. If it comes on and then turns off, you probably have a bad power connection. DC power jack may be bad and would need to be replaced or re-soldered.
-=/ Daft Tech /=-
Hi, Ofcourse you to disassemble it and have only the main board and then underneath it is that connection of that jack, so things you need are, 1- Soldering iron and soldering wire 2- Screw drivers 3- Multimeter 4- the spare jack 5- Love / Care for you laptop, so that you dont mess it up.
I found the solution - and implemented it, it works. The blue (ID) line needs to show 7.5v. The simple way to acheive this is to simply put a 47k resistor from the +19.5v line to the ID line. Apparently there is a pull down at the computer end that means it ends up at 7.5v.
I cut the cable about 6" from the old HP power supply. I then soldered a female power socket onto the loose cable and soldered the 47k resistor between the ID line and the +19.5 line. I then plugged this onto my two pin power supply and the plugged it into my computer. It works very nicely.
Not wishing to junk the HP power supply unecessarily - it was still producing the 19.5v - I then soldered a power plug onto that ignoring the ID line. That now works as well. It seems that the circuitry that provided the 7.5v ID voltage in the HP power supply became flakey. I could have just opened up the power supply (I have already done that) and disconnected the blue line from the circuit board and just tied it to the +ve line via the 47k resistor and then wrapped it with the usual insulating tape.
This overheating problem is due to the bad connection with the power supply. Check the jack on the machine to see if it's cracked, broken, or loose. If it is, then you need to have it fixed imediately. A broken or loose jack can cause an electrical arch and do severe damage to the machine. If the jack is good check the supply. if the supply is worn out, loose, and not making a good connection it can do damage as well.
Shutdown the laptop Unplug the power supply Remove the battery Plugin the power supply Turn it on If it works then the battery is shot and needs to be replaced Still doesn't come on replace the power supply If you replaced the power supply and it still doesn't turn on, then the you'll need to get it service as the motherboard would have to be replaced.
Sounds like a power supply fan problem - these can be easily and fairly cheaply replaced - it does not need much experience or skill to do this, but in order to purchase a new one you probably have to go to a repair shop anyway, so for a few bucks you can probably get them to replace it anyway.
If you want to check it yourself, establish first of all if you can open the case, then listen to each fan individually (being careful not to touch anything at all inside) hopefully identifying which fan is the noisy one. If you feel competent to remove and replace this yourself then ensure the power is off and that you have adequately grounded yourself before touching anything inside, remove the offending fan and find a pc supplier who can get you a replacement. If you just want a quick fix - usually only lasts about a week - then some PTFE (teflon) spray can sometimes help noisy fans, but truly when they are on their way out they need replacing.