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Most printers have a built-in diagnostics program which can be very useful for troubleshooting problems and test-printing without a computer. They are usually initiated by pressing a button or two while turning on the printer.
Printing photos? Make sure that they are of print quality - meaning 300dpi. Anything lower than this will appear pixelated and lower than photo quality.
Flashing light on your printer? Each printer has a different reason for a blinking or orange light but in general it is due to a paper jam, an empty paper tray, a printer cartridge problem or a problem with the printer hardware.