All Black colors change to red with some red shadows you suggested some loose connection I refix there was no loose beside color do not fixed when I turned the computer upside down , Toshiba satellite P205D-S7802
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It sounds like your screen might be going bad. Normally there is no setting you need to be doing to adjust colors on your screen. There are some settings when you click Start/Control Panel/Display to look at your display settings, but these normally just control the color around the windows. For example the normal or default color for the strip that is at the top of your internet browser is blue but you can change it. I would say that when you boot your machine if the colors are not what they should be normally during the boot process, then your screen is going bad. You might try Opening a Word Document then type words such as Black, Red, Green, Blue, Yellow, etc. on different lines in the document. Then highlight the word and change the font color to match the word. This might let you see if your colors are true colors or if the screen is bad.
It seems that someone changed the desktop background color. point the mouse somewhere in the middle of the desktop, (away from any icons) and right click the mouse, a menu will appear with several options. The bottom one says properties. Click that. Once done another (more advanced) menu will appear with several tabs at the top. Click on the second to last tab, labled, "Appearance". Once in this tab. Toward the bottom right side of this screen you will see 2 buttons one atop another labled, "Effects", (on top), and, "Advanced", (below). Click the advanced button. A new window will pop up with the first option being desktop in a drop-down menu. To it's immediate right you will see "color 1" with a drop-down menu directly below it. That is where you will select the new background, (desktop) color. Once you have selected the new color, click OK, then apply on the remaining screen, then OK once the color is set.
The easiest thing would be to check your cable for a bent or loose pin. Next put another external monitor on the laptop. The circuitry to provide video to the laptop screen and the external monitor are separate except that they share a video processor and video memory. There can be bad electronics involved.
sounds like you have a loose connection ....either into the screen or into the motherboard....the connection between board and screen runs through the hinge brackets and often comes loose after machine has been opened and closed a lot.....need to be comfortable opening up laptops to check the cables as it can be tricky to get to the back of the screen where the end of the ribbon cable is..