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My HP screen just flashes blue red green and black, even without the vga cable inserted.

HP Recommended
HP L1950g
Microsoft Windows 10 (32-bit)

After my last VGA cable gave in, i finallt got my new one.
Wanted to plug in my second screen and even without the vga/dvi inserted, just the power cable the screen starts flashing colors, then to black, then the colors again. cant get into the options. none of the buttons do anything. screen has always worked perfectly, nothing changed and all of a sudden i cant do antything anymore. is there any way to fix this?

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