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P25 S507 On start the screen shows "Toshiba" then goes black. I can hear windows start. Screen is good

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Useful follow-up and practical next steps based on the thread so far (notes for and anyone landing here later).

Given what has already been tried and ’s suggestion about the lid sensor, focus the next checks on the internal display path and what a shop will actually need to reproduce the fault. The goal is to eliminate simple, inexpensive causes before assuming a motherboard (MB) fault.

Quick, safe checks to do yourself or ask a tech to do first:

  • Try an external monitor (or TV) and confirm whether the GPU shows output there. If external works but the internal doesn’t, the fault is inside the laptop display path.
  • Test the lid-close sensor: a small magnet moved along the bezel can reveal a magnetic sensor; keep the magnet away from spinning HDDs and cards. If the screen toggles, the sensor or its wiring is the culprit.
  • Visually inspect and gently reseat the display cable at both the board and panel. Look for frays in the hinge area. Ask a tech to measure the display connector pins for the logic rail (3.3V/5V) and the backlight/inverter power—absence of these rails points to the MB.
  • If the screen briefly shows the BIOS/logo then goes black while Windows starts, ask them to boot to BIOS and to try a display toggle (Fn+display key or Windows+P) to rule out an OS/driver output switch.

If you consider taking only the motherboard in for testing, bring the LVDS/eDP cable or the entire lid assembly if possible. A reputable shop should: bench-test with a known-good panel, show you the fault live, measure power rails, and give a written diagnostic and price estimate before further work. If the MB is at fault, options are replacement, BGA reflow (often temporary) or reball (more costly, more permanent) — weigh repair cost against laptop value before committing.

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Member Avatar for BigPaw

Do you happen to have a spare monitor, or a cable to connect to your TV? (many modern TV's support this)

You need to test whether your spare monitor or TV "goes black" in the same way your laptop display does. If your spare monitor or TV show your laptop booting okay, then there is a problem with the screen unit of your laptop. (potentially the inverter, or backlight, or in rare instances a hinge switch) But, if the same thing happens, your spare monitor or TV "go dark" too, then it is likely a fault with the video controller on the motherboard.

Member Avatar for locksmithles

the inverter and screen are ok , I put them on my second P25 and they worked fine. Can I take just the MB in to be tested?

Member Avatar for BigPaw

That's entirely up to you, my friend. :-) But, may I suggest that you check the sensor that detects if the screen is closed?

Something else you should take into consideration, if you take only the motherboard in, you are not allowing them to see for themselves what the fault is, and that is very important when it comes to diagnostics.

Also, if they are able to perform some tests on the motherboard and find nothing wrong with it you may still have to pay them.

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