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1) First thing to check is the AC adapter (Charger) power output. It is 19 Volts (DC) Suggest use a multimeter to check. An economical, yet good enough for this test, multimeter, can be purchased for as little as $8 to $12. Available in a multitude of stores. An auto parts store is but one example.
In the above video -> DO NOT TEST THE POWER LINE CORD -> GOING INTO THE AC ADAPTER (Charger) 0:00 to 3:58 in video.
-> TOO DANGEROUS. Take the power cord to a pro to test it. AGAIN -> DO NOT TEST THE POWER CORD 110 to 220 volts will give you a BAD SHOCK to -> FATAL <- (Can kill you)
For the second part of the test starting at 3:58, it is okay. You will be testing for 19 Volts -> DC If the voltage shown is not at least 17.1 Volts (DC), (90 percent), the AC adapter is no good. Replace.
AC adapter checks out? Then it's time to check the DC Power Jack. (DC_IN on the laptop. The jack on the laptop you plug the AC adapter into )
2) Remove the Battery. With a non-metallic object, gently see if you can wiggle the center pin of the DC Power Jack around. ANY perceptible movement means a bad DC Power jack.
Good news is that it is Not soldered to the motherboard. It is attached to wires, that are attached to a small white plug in connector. (DC Power Jack is connected to a harness),
Looking at the motherboard in the photo, you will see two green squares. The middle square is the Processor.
The green square to the right is what I want you to look at. Specifically, the small white connector to the right of it. (The green square is a chipset. It has a white triangle < pointing to the Top/Right corner)
Put your mouse cursor on the photo. (Magnified view) Go to the small white connector to the right, of the green square I indicated above. Has a small white arrow ( > ) pointing to the Top/Left corner of the white connector. This is the CN5 connector on the motherboard.
If the DC Power Jack harness is not the problem, then the problem is Power MOSFET's on the motherboard, and or Capacitors. (Ceramic SMD capacitor/s)
[Just basic info. Pertains to an HP laptop. Just want you to see about Power MOSFET's,
To clear the Boot password. Open the case and locate the small round disc battery. Next to it will be a small plastic jumper with a board label referring to battery jumper. The jumper sits on three pins and has only two contacts. Lift the jumper and place it over the other pin keeping the center pin connected when put back on. This will short the battery supported ROM memory which is set to ask for a password. Put the jumper back and reboot the computer. It will no longer stop and ask for a Boot password. If it stops and asks for a Windows Password you will need to go to a tech to have the password removed. (This is very simple to do with a Password CD in a couple of minutes)
you need to get a disk of your version of windows and run a repair. the vista/7 disks have a start-up repair option, and xp disks have a "recovery console". if you are doing xp, try running "fixboot" and "fixmbr" commands at the recovery console command prompt.
Usually when you are updating the BIOS, you are warned that your computer must be plugged in and you MUST NOT interrupt the process, otherwise your computer will be rendered inoperable. Looks like that is what happened to you.
The only suggestion I have is to seek help from the Toshiba website--search for something like "BIOS update inerrupted" in the upper right corner of the website.
Have you dusted out your PC lately with some canned air? If your system is hanging up, it could be an overheat issue. Usually this will cause a reboot, but sometimes it will just stall and you have to do it yourself.
In such cases its practical to change the SMPS with a working power supply of the same rating and then trying it out. If with the new power supply it works fine then cange your SMPS. Also make sure that all cables are snug tight and generally ree from dust. The same applies to your RAM too................sodeep