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If display is blank you likely have a bad display or some other problem that will require replacements parts. Keep in mind that on Lexmarks the control panels are keyed to the formatter so you cannot just get a used panel from another printer, you must purchase a new one.
Do this, click start > click control panel > choose and click printers and faxes (you see inside icon of your default printer). right click hp3550(icon) > choose and click properties > click services(you see inside services maintain my printer). click Align the print cartridges(if finished alignment)and also click Clean the print cartridges(if finished). try print test.
1. Turn off printer 2. Hold down Resume button and press Power button. 3. Keep holding down Power button and let Resume button go. 4. Press Resume button 2 times then let BOTH buttons go. 5. Green lights will flash and then stop blinking. 6. When green lights are solid, press the Resume button 4 times. 7. Press the Power button and the printer should turn off, if not, press the Power button once more. 8. Your printer should respond as normal.
I have the same model (about a year old) but there are no lights visible on the back of my printer (neither red or green). Have you contacted the Lexmark tech advice website about this problem? They may take a few days to respond but there are numerous possibilities in trying to locate the fault (probably in the power circuitry) and it might have to take it to a repair shop to get it tested (if it is not under warranty).
I eventually discovered that the blinking was simply caused by the printer running out of ink. I intially dismissed this as a possibility because Windows always used to warn us when the ink was getting low. However, I presume that we no longer get those warnings now that we're running on Vista rather than XP - a compatibility issue I guess.