All the lights on my hp 845c are flashing all at once and i can't print anything

You need to install the printer driver.
You can download the HP printer drivers from their support WEB site. Please click on this link and select your model printer to download :- http://welcome.hp.com/country/us/en/support.html

Try using the HP Print Diagnostic Utility in Windows - HP Customer Care (United States - English).

If you need more help come back.Post / thumbs / testimonial are welcome!

There is some problem with Printer Cartridge. You check your both black and colour cartridge. You can download different types of drivers from this site. Drivers Download

I've seen this before with these printers. They will print a test page ok but nothing from the computer. Reload the driver. In fact go to the HP website and download the newest driver and install it. This should solve your problem. You should find your drivers here http://h10025.www1.hp.com/ewfrf/wc/siteHome?lc=en&dlc=en&cc=us Let me know if you need anything else.

hardrocko

Thanks for using FixYa

try to power off printer then power back on, this is usually a print job that is qued up but not printing, also if you have any print jobs in your windows printer que, delete them with the printer off. this will clear the printer. otherwise check for a paper jamb.

It is require servicing if you can open the cover and apply some lubricant oil on the steel rod it will fix the problem otherwise show it service center.

hello ! please check if the catridges is seated well .may be the sensor have not detected the catridges ., so as to reset the printers memory .

good luck

can print letters and such, but cannot print pictures. I have put in new ink . So why can't I print a picure. have never had this problem. All 3 lights start flashing.

Check for any paper jams, I think the orange light mean that there is a error and therefore cant print, check incartriges and other areas inside

When the orange light is flashing, either paper jam or ink problem is happening.Try unloaging & reloading the stack of paper in the main tray. Remove & reinsert ink cartridges in the printer. You may also clean the contacts of the cartridge and inside the product.