My daughter's Toshiba laptop is having problems turning on.
We checked the voltage of the power supply and it is 34 plus volts; supposed to be 19.5 volts......
We don't know how long it has been this way.... and we don't know if the power 'fluctuations' are regulated by the battery or internally.
The battery is supposed to be 10.5 volts; we can't tell what the voltage is now because the multiple connector pins are covered on the battery.
The 'turning on' problem happens with or without the power supply plugged in.

Did the excess power supply damage the battery? or the computer or both?

__________________

"Our Lady of Blessed Acceleration...
don't Fail Us Now"

any major computer retailer that deals toshiba and ask to plug in and boot. That should tell you WTF.

I have spare toshiba PS if you need it. PM me.

The power supply may be damaged internally, or you may be measuring across the wrong parts of the DC tip. There may be two or three contacts on the PS tip: the outer metal collar, the inner metal collar and (if it has one) a central pin.

If you've got it measured correctly, then it may be an internal failure of the auto-sensing circuitry - the power supply is probably "universal" and detects the AC input voltage (110 ~ 240) and adjusts the output to 19 V DC.

A 34 V input may/may not be enough to cook the laptop and/or the battery.

Like Stoney recommended, I'd take the laptop to BestBuy or a retailer and ask to plug in to a Toshiba adapter. Remove the battery and plug it in; if it boots, you're okay - but may need a new battery, if not...

The power supply may also not be able to regulate voltage under zero load. See what the voltage is loaded for an amp or two of current.