Will not turn on (Toshiba Qosmio) AC adaptor plugged in but nothing happens when I turn it on?

try doing the hard reset; remove battery and ac adaptor and press the power button for 30 sec; after that reseat the battery and the adaptor and power up the laptop.
let me know if that is working for or not.

replace the adaptor and then check.

Remove battery. Maybe faulty? Try another cord/charger with the EXACT same specs. Reseat the Memory Mods. has the AC jack been damaged by pulling on the cord? Try plug in and at the laptop's AC jack "wiggle" the AC jack plug. Any change?

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This site sells parts for the Toshiba Qosmio G30-140 and other hardware.

The only thing left to do is to reinstall, the corruption is too great to recover.

Does it get to POST? (that is the BIOS menu).
If it does immediately press F8 that should get you into the recovery menu.
If it doesn't,

Try firstly removing the laptop's battery as it may be at a critical voltage and the system will not start because of it. Plug in your ac adaptor and monitor what happens. Does the power light illuminate? If it does it should then boot up, if it doesn't, try a known good ac adaptor before going any further.
If the adaptor is fine and the laptop still won't start, then you may have a mother board fault and should contact a dealer/repairer for further advice.
Hope this helps.

Dear Sir,
Try this, remove the power plug and battery, wait for five minutes and plug the computer to power with out the battery and try to start it.

It is not a driver or video card problem. It is the monitor.

To be sure plug a full size desktop monitor into your laptops monitor jack. Every laptop has one. If the picture doesn't turn yellow that will confirm that your LCD is bad.

have you checked your ram? remove it and see if it powers on and qickly turn off. if it powers on replace ram after shutdown. if problem not fixed coud be cpu problem or mobo.