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Re: toshiba laptop power light is on but nothing is...
When you turn the computer ON, can you hear something running on the laptop? If yes, have you tried taking out the battery & just turn the computer ON with the ac charger plugged-in? If you tried to turn ON the computer with the fully charged battery with the above troubleshooting but still there's no display on the screen, then I think there's something wrong with your hardware (maybe the LCD or the motherboard). You could also try using an external monitor to test if it's your LCD that's defective, if not it's your systemboard. Try calling their tech support hotline.
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Not all oem's are created equal, this sounds like a power supply issue. I would be tempted to try another power supply, first remove the main battery and press power, if it comes on the rechargeable battery is bad, replacement only option.
Your problem is far more than the battery. Your problem is the power cord. Laptops for the most part will work off the power cord even if the battery is dead or even if the battery is not in the laptop. Your power cord charges your battery and if it is bad it will not charge it. You've been working off your battery even though you might have had the power cord plugged in, but if it's bad and not charging the battery, the battery drains and then you can't get the laptop to power on at all. Go purchase a ac adapter and power cord that is designed for your system. Don't buy one that some of the big box stores sell that has a an interchangeable plug at the end designed to fit just about any laptop. Those will eventually burn *********** board out.
Try resetting the BIOS in case something happened to it.
Power down your computer. Remove the power cord, the rechargeable battery and the BIOS battery. Wait 10 minutes. Reinstall the BIOS battery, the rechargeable battery and the powewr cord. Restart your computer and enter the BIOS setup.
If nothing happens, your video card may have failed.