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Power on the machine, check front panel 'cartridge led' blinking? replace the cartridges,if 'paper led blinking' indicates paper jam check for paper jam.If printer comes in ready mode check in system drivers its is ready mode?.. if no check parallel cable if its good replace formatter..
If the printer is new, then maybe the printer catridge nozzle seals have not been removed and so the catridges are not being detected.
If it has been working before and then the problem starts, look at which light is blinking because the paper and catridge lights are different. So check wich light is on and get to me for further instructions. thnx
reason of all led check all step by step
1. cartridge short or fail
2. encoder strip not working
3. paper sensor not working
4. carrige block data cable brake
5. carriage block pcb fail
6. main pcb fail
uaually the LED blinnks when there is no ink or when it runs low on ink.
But since the LED is kept there to indicate any error happens to the printer....
1. So I suggest that you should take out the printer cartridges and check all of them....shake well before you put it back.
Now open Control panel - printers and fexes - right click HP 5550 - Properties
There should an option to see the ink levels. If you can see the ink levels....it means that printer can detect the cartridges. Now the printer LED should be turned off.
If the above doesn't work, try this;
Check the printer que .. if there are print jobs pending, the LED will blink. Delete the print jobs, and restart the machine.
This should solve your problem.