Laptop power is dead?    See life span.      

You are here from my PSU  power isolation test page,  but your Laptop is not a desktop and has no PSU , but  it does have what you see below:
All  PC's boots slow in cold boot mode (HDD boots from SCRATCH ; the word boot means boot-strapped or means from EMPTY RAM , or the OS IS NOW GONE FROM DDR MEMORY)
In hiberate mode  or Sleep mode, the PC does not boot at all , it RESUMES and is very fast to wake up,  sleep mode will fail if drivers are missing.

The first photo below is nice block diagram that I modified greatly, from year 2005 I think.
The power pack runs the main power regulator charger seen below with MAXIM stamped chip.
If the Battery is shorted ( we always remove the big battery first) and test and replace the coin cell at 7 year age.
We connect the power pack and make sure the power to the MOBO is 19vdc or as your PC spec. shows. (all tech;'s now power is first, power must be at spec)
Next the owner of said Laptop pushes the power switch on and the power controller chip seen here an Intel 8051 greatly modified derivative , chip runs BIOS code in BIOS ROM below.
This chip  (8081 brain) check if you are resuming from sleep or doing cold boot, first. (old boot-straping  a PC is from nothing at all in RAM)
If cold booting that chip turns on the fan first, and  makes sure the PC first is not overheated (over 80C is overheated 60C is normal) and then if fan is dead or weak, or too hot it shuts the PC of fast or delays startup
Each maker of PC has their own rules on heat, and fan speed, most smarter PCs run the fan real fast to start, them slows down if heat is under control. (some folks cry about the noise) so some PC, risk starting fan slow. (you asked for it)
Next the BIOS then runs full diagnostics (POST for power on self tests) looking for things dead, and if dead devices found , beeps or sends  blink codes to the Caps lock key is popular. (or sends text POST errors to the screen)
The BIOS runs PnP plug and play scans of all chips  (remember some device inside are option or some are upgades) and the  results are stored in shared RAM location for the OS to use.
If no errors happened the PC BIOS  then lastly attempts to boot up, all things in order in the BOOT ORDER PAGE, for faster boots use HDD0  as 1st in the list.
If the PC can not find the OS startup files  it may do odd things, those things are,  show errors (no boot found) or other odd or unfriendly things (black screens, beep codes, or boot loops , and last just shows the BIOS page and freezes.
Some PCs the BIOS needs to be upgraded, or the PC likes to overheat too easy. (2008 year PCs take the cake here)

The chip above looks like this below. This is a base power controller processor.
VRM = voltage regulator modules and also act as electronic fuses, (they detect load shorts and simply shut off)
If  VRM shuts down pull all modules not needed off the MOBO,  leave the CPU alone, most never fail do to self shut down at 90C.  ( HDD pulled, DVD drive pulled, all RAM pulled and tests 1 by 1.)
SDmedia card pulled, modem pulled, wifi card pulled, for sure all USB devices pulled first, to see if the PC can POST clean.
The boot brain chip is below from year 2006. This chip does all booting of any kind, and resume or hibernate modes and controls power an fans.
The Chip below is not pure logic, really it is a processor and runs 8051 instructions from the maker of your PC,(OEM) and varies by every maker, every model of PC and sub models, and BIOS version. (yes complex)

This is just one example of a chip for power control , there are many more, but one example is nice to have. The 8051 is the heart of a  very old Intel Microcontroler 8bit from year 1980.

One way to think about any Laptop in the context of any PSU powered Desktop is to know that they moved the PSU regulators inside the Laptop on the motherboard.
Because that is what they did and added 1 or 2 battery packs and a battery charger chip to the same mobo seen above.
 (to test any laptop, first take out the huge batteries ,  usually just 1,  and see if the LT runs now.? Batteries can short, and overload regulators.
Step 2 if PC is over 6 years old is a brand new fresh RTC coin cell battery now. (or pay H3LL)
The first test is always the AC power pack and my PC is 19vdc 100watts.  Only your PCs full spec tells you what packs work. (volts/amps/watts)
This Pack is just  raw DC pack. (it has no VRMs inside) (AC to DC back,  120vac to 19vdc)
We use A DMM meter to test voltages and for sure turning it on, or actual on now.

The Laptop has a large number of power regulators.   5 or 6.
To isolate shorts in any Laptop (LT)
We remove all modules on any LT to find modules of any kind  that are shorted, and overloading any of the many regulators. (large battery out first , as they just love to short and overload power regulators)
Normally and best , power comes from the 19vdc power pack (aka: the AC pack) best is to test with only this supplying power , main huge battery out.  Keeping AC line hot, also makes the batteries last longer (LIFE SPAN)
That 19vdc must make it onto the mobo actual pins and not have broken power jack at the DC plug at the MOBO raw edge (PCB).

Drawing LT#1:
Here is my Laptop power state drawing,  2009 made PC.  These power states are complex and are the work of the power controller seen above. Count them 6 power states not just on and off
See to that the latops never really turns off ever (unless all batteries {2to3} and power pack are pulled)
There are 6 states, of operation, for sure normal, sleep and hibernate.
If all batteries are dead or removed the RTC coin cell must be good or the PC will never turn on.  (there are up to 4 power sources here, COIN, Main1, MAIN2 battery and AC power pack 19v) 1 of the 4 must be good.
If the coin cell is dead, all bets off.  BIOS goes NUTS, all batteries main are pulled and AC line pack is removed., (the coin cell  keeps NVRAM alive , with zero power from all 4 sources the PC is now dead.)
The 7th state is all things removed power wise and the coin cell, this is done  in some case to clear up chips stuck in latchup mode say after and ESD or lightening event, I call it the DEAD COLD RESET. state 7
S0 is full on power state (  S3 is sleep and S4-S4/AC is hibernate?)
If you have a schematic like me below, matching your PC not mine, we can test each regulated supply seen here.
If one supply rail reads wrong (10% out of spec or more), we remove modules to find out if one is shorted.
Never condemn any MOBO until you prove all modules connected. are not shorted by removing to clear that short (short means gross power overload)
The regulators on all MOBO all shut down overloaded, in all cases.  (that is why there are NO FUSES)
Lacking a real schematic means all you can do is measure voltages the hard way, (key voltages) and pull modules. Click the photo below to ZOOM to full size,.

My HP drawing #2 , logic only, not power. (the word Clarkesfield is the intel project name)  Ibex Peak is the Intel project name for 1 South bridge. HP 8540w.

The USB 3 port is dead in BIOS, but not in windows 10. ( a need to know thing if using BIOS with a keyboard or mouse)
On top failure of all Laptops made is this, the LT with no pig tail seen below in red, are the worst of all,  the jack fails. on both but the below is easy to fix, not the direct soldered Jack
This is the 19vdc power jack . (from AC /DC pack to here) If the below jack end face, looks bad, it is ! This is 2 pin jack the 2nd wire there is to handle more current .

the old jack was a total wreck, so we unsoldered it and reSoldered on a new one.

Hopefull this is obvious what is wrong, and the cure. (a new one)

Latops can last for 20+ years,  it is a fact. (but my joke is , Laptops are rated in DOG years,  7:1)
Here is list of things that never last a long time here (in ORDER of first to fail) ( A dropped PC can kill the HDD dead easy if running it is)
  1. The huge battery in the LT (snaps off bottom if you are luckly like me) will in fact fail in 1 years time if abused (means not using the AC pack most the time!) {worse, old batteries can catch fire !}
  2. Next is at 5 years the HDD dies, LT HDD are really junk (toy) class rated,  you can upgrade it but if smart get a SSD now.
  3. Next is the 7 year limit on the RTC coin cell, (Deity help you if you own those pesky Toshibas with rechargable  Coin cells. and maker does not sell them so this is a PAIN) only them .
  4. The above power jack end or cable end can fail at anytime, even in the first 5 years, if you stress it , it WILL FAIL.
  5. The kids played with the laptop and is now dead or is sick or someone (kids)  tried to upgrade windows, and 1/2 the chips inside are dead; stop that  please. (ask how first ok?)
  6. Advice, never buy a PC made in 2008 or get BGA GPU solder ball failures.
  7. Always buy a 2010 or newer PC or monitor and get LED LCD screen, never buy CCLF PCs.

version 1.  11-9-2018