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My computer toshiba is not turning on

The screen does not turn on at all. It has no light but the charger light is the only light that turns on.

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  • Toshiba Master
  • 5,660 Answers


I would like you to read that part. Means somewhere, someone, (Staff?), has taken it upon themselves to attach previous solutions, to your posted problem.
(They do it with my previous solutions given, also)

I have seen, "Gary Oldman plays the Bagpipes for You", and, "20 Ways to Knit a Cardigan Sweater"; given as solutions in the computer category. Guess you should feel special, that the suggested solutions even come!

A) Nope. It is NOT an obvious 'board issue'. (Reference is to the motherboard)

B) Screen turns Black means a problem with the screen.

Really? (You're going to post that on a the world's largest product support website, and with REAL technical experts in this field looking on? Yeah,...Right!)
(....after all these were done, you must definitely get ride to this mura.......!O_O! What does THAT mean????????????)

Moving on.............


Leave the guessing to those who like to play games.

("I bet aliens in the middle of the night, came down and put a virus in your laptop. If just the LED light on the 'charger' lights up, you know you've been had! Put a tinfoil hat on to protect yourself!")

1) The 'charger' in reference is an AC adapter. It converts the AC electricity from your home, or business; into a low DC Voltage.
(Can also be said as low DC electricity)

The LED light on the AC adapter, is an indication the AC adapter IS receiving power.
NOT an indication the AC adapter is working.

AC adapter is tested with a multimeter. See if it is putting out the correct voltage.
On the AC adapter in a label, is the Input voltage, and the Output voltage.
Example: Input: 100 ~ 240VAC @ 50 ~60Hz
Output: 19VDC @ 4.34A

Means the AC adapter can use AC electricity, that is from 100 to 240 Volts, and either 50 Cycles per Second, or 60 Cycles per Second.
Hz = Hertz. Hertz stands for Cycles per Second

Output is 19 Volts DC, and at 4.34 Amperes
The number to be concerned with here is the 19 Volts (DC)
19 Volts (DC), or VERY close; is what should come out of the cable, that plugs into the laptop.

Also suggest have an assistant gently wiggle the cable, that goes from the AC adapter TO the laptop.
If there is an intermittent reading on the multimeter, this suggests there is a broken wire in that cable.
Same procedure for the power cable TO AC adapter.

Not feasible for you, then take to nearest small computer shop, and have the resident tech check it out. Should only be a couple of bucks.

Tech indicates it's bad, has a new one, or universal one they will sell you? I think I would take my old AC adapter, and leave. May be on the up and up, may not.
If it is said that the AC adapter is bad, and you can buy a universal one almost anywhere; THEN I would tend to believe the person.

AC adapter needs to be working, and correctly. (Proper output voltage)
Charges the Battery, and also can power the laptop by itself.

2) DC Power Jack:
The DC Power Jack is the jack on the laptop (DC_IN), that the AC adapter plugs into.
If there is a problem with this jack, the laptop will not receive power.

There are various styles of DC Power Jacks.
Most common is the style, that has a large Center Pin in the middle.
AC adapter removed, Battery removed; a small object is used to GENTLY see, if the Center Pin can be moved.
ANY perceptible movement of the Center Pin, indicates replace DC Power Jack.

With the older style of laptops, the DC Power Jack is soldered directly to the motherboard.
With the newer style it is not.
The DC Power Jack has wires coming from it, (Cable), and they end in a male plug connector.
It is now referenced as a DC Power Harness.
Much easier to replace, than the old soldered on version.

3) Bad Power On switch.
It's a small carbon button switch, and they do go bad.

4) All of the above checks out, then the problem is the 'board'.

More specifically small electronic parts on the motherboard, have gone to the 'Great Electronic Parts store in the sky'.
(How's that for technical? lol!)

Usually Power MOSFET's on the motherboard.
Many people then replace the motherboard. Some of us do not.

Using the HP Pavilion dv6000 series, and Pavilion dv9000 series; of Notebook PC's for an example,

Here we see the Fairchild Semiconductor Industries - FDS6679 - Power MOSFET, and Alpha & Omega Semiconductor LTD - AO4407 - Power MOSFET; is being used.

Both are Obsolete now, but there are cross-reference examples given. FDS6679 cross-reference example,

One dollar and one penny - USD

Price of replacement motherboard? Averages from $50 to $250
Also add labor cost.

HOWEVER, there is more information that I need from you;

1) You indicate, "The screen does not turn on at all. It has no light but the charger light is the only light that turns on."

Meaning ONLY the AC adapter's Power On LED lights up?
No Battery LED light on the laptop?
The small fan is not running?

Makes a BIG difference if the fan is running.

Also post the laptop manufacturer, and model number.
The model number is on the Bottom of the laptop.

Using Compaq and HP laptops as an example, post the Product Number.
This is P/N in the white Service Tag, on the bottom of the laptop.

Post back in a Comment.

Posted on May 06, 2013


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SOURCE: Screen went black while using my toshiba satellite

My own suggestion to this problem is that, when the screen trurned to black like that means that somethng has happened to your screen. Then, you needs to trubleshoot you pc, in what ways? Simple plug your pc with the recommended adapter and start pressing your caps lock to find out whether the blue light will comes up, when the blue light comes up, your pc is ok, then, your have to deal with the screen first check the screen module as well as flex cable at the back of your pc after all these were done, you must definitely get ride to this mura.

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SOURCE: My Toshiba Satellite won't turn on at all

If no lights/nothing happens when you press the power button then you probably have a corroded power socket on your motherboard, the positive terminal will not be connecting properly to the motherboard. The laptop needs to be dismantled and have the socket resoldered properly. This can cost quite a bit at most places. I would check the charger first to make sure it is not the problem.

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SOURCE: turn on computer light coms on boot screen doesnt

Check the processor fixed with the motherboard properly

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SOURCE: toshiba satellite a40-s270 won't turn on

Either the power supply is not working or the battery has failed and will not hold a charge. If the laptop is 3 or more years old, the battery is the likely suspect.

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Charger is faulty, must get new one.

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