Member Avatar for CSCRDUMF

Hi all,

I was using my Toshiba laptop, and all of a sudden, the screen went black, the power light went out, and it died. I have tried turning it back on, and the blue power light comes on for a second or two, and then goes back out and the laptop won't turn on. I have unplugged it from AC power supply; no changes. When I plug it back in, the blue light that comes on when the battery is charging did not come on. I took the battery out and put it back in; no avail. The laptop was not hot to the touch, and it had been turned off for several hours prior.

Any ideas?

Thanks!

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  • Latest Post Latest Post by wagle

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This looks like a classic sudden-power-failure symptom. is right to point at the manufacturer reset steps, which are model-specific, but there are a few practical checks to run before opening anything or paying for diagnostics.

First, try a proper power reset: disconnect AC, remove the main battery, then press and hold the power button for 30–60 seconds to discharge residual power. Plug the AC adapter back in (leave the battery out) and try to power on. Next, verify the adapter and DC jack: confirm the adapter’s LED (if present) and, if possible, measure the adapter’s DC output with a multimeter (match the voltage on the adapter label). Inspect the laptop’s DC jack for looseness, burn marks, or play while trying to power it — intermittent contact often shows exactly the brief-flash symptom you describe.

If that does nothing, try minimal-component testing: remove or reseat RAM modules (test one module at a time), disconnect the hard drive and optical drive, and then attempt to power on. Listen for fan spin, drive activity, or any blink/beep patterns — even a repeating LED blink can be a diagnostic code worth noting. Be careful with ESD: work on a nonconductive surface and unplug everything first.

If none of the above helps, the fault is likely on the power circuitry (DC jack/smart-power board or motherboard). Replacing a DC jack or daughterboard is cheap; a full motherboard replacement is not. If the laptop is under warranty, stop and contact support. Otherwise, document the exact behavior and the steps you tried before taking it to a repair shop — that saves diagnosis time and cost.

Member Avatar for wagle

Look for troubleshooting power-on on the manufacturer's website. My iBook would do nothing when I tried to power on until I pressed the 4-keys-at-once sequence that told it to reset the power-management unit. Then it was fine.

Could be something else, too, of course, but the troubleshooting guide will walk you through the scenarios. Persist, also, sometimes the more advanced things are on different webpages.

Hi all,

I was using my Toshiba laptop, and all of a sudden, the screen went black, the power light went out, and it died. I have tried turning it back on, and the blue power light comes on for a second or two, and then goes back out and the laptop won't turn on. I have unplugged it from AC power supply; no changes. When I plug it back in, the blue light that comes on when the battery is charging did not come on. I took the battery out and put it back in; no avail. The laptop was not hot to the touch, and it had been turned off for several hours prior.

Any ideas?

Thanks!

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