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Try with this. Or you can tell us which graphic card are we talking about.<br />
<br />
<a href="https://www.youtube.com/watch?v=ApQEcnU_fSo" rel="ugc">https://www.youtube.com/watch?v=ApQEcnU_fSo</a>
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Which drivers? Chipset drivers? Video drivers? Start with that. Check the compatibility of these drivers if the laptop is older.<br />
Is there any power management tool installed?<br />
<br />
Try to change the power plan to High Performance.
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Most Toshiba laptops have 2 graphics cards. One could be NVIDIA which is a higher performance, the other one an Intel card. The Intel card is usually more energy efficient so that is most likely the default when the laptop is not plugged in, the secondary card, is usually the higher performance card. This Card is most likely utilized when the laptop is plugged in. This would explain the two separate responses when plugged in and not plugged in.<br />
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This however is just an educated guess at the moment as we do not have any information on the model or the exact errors.
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It's a Toshiba L-50D-B-179. I've attached a video that shows what happens..<br />
<a href="https://filedb.experts-exchange.com/incoming/2018/04_w15/1296444/video-1523290681.mp4" target="_blank" class="file-inline" title="Video showing what happens when it's plugged and unplugged. (2.6 MB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>video-1523290681.mp4</a>
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Video showing what happens when it's plugged and unplugged.

video-1523290681.mp4

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solved the problem - THANK YOU!
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Toshiba laptop. Videos from YouTube go black unless it is unplugged...user has upgraded the drivers. Any idea what could cause this and how it can be remedied. Thank you.
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Toshiba laptop. Videos from YouTube go black unless it is unplugged...user has upgraded the drivers. Any idea what could cause this and how it can be remedied. Thank you.

YouTube videos only play on unplugged Toshiba - dark otherwise

A monitor or a display is an electronic visual display for computers, usually comprised of the display device, circuitry, casing, and power supply. The display device in modern monitors is typically a thin film transistor liquid crystal display (TFT-LCD) thin panel, while older monitors used a cathode ray tube (CRT) about as deep as the screen size. They are connected to the computer via VGA, DVI, DisplayPort, Thunderbolt, LVDS or other proprietary connectors and signals.

Displays / Monitors

YouTube

A laptop or notebook is a portable personal computer with a clamshell form factor, suitable for mobile use. Although originally there was a distinction between laptops and notebooks, the former being bigger and heavier than the latter, there is often no longer any difference. Laptops are commonly used in a variety of settings, such as at work, in education, and for personal multimedia. A laptop combines the components, inputs, outputs and capabilities of a desktop computer, including the display screen, speakers, a keyboard, and pointing devices (such as a touchpad or trackpad) into a single unit. The device can be powered either from a rechargeable battery or by mains electricity from an AC adapter.