HP officejet t45 will only print in black. how do i get it to print in color?

Check the printer properties to make sure it isn't printing in black and white only.

To support the Officejet T45 in Windows Vista, install it using the Officejet R45 drivers. Color printing and high resolution output is supported using that driver!

Try the HP 950C as your driver for the T45, it worked on mine.

There are no official drivers for the T45 in Vista. You can, however, use the Officejet R45 drivers instead. It seems to work well, and supports color printing.

The HP T45 uses the HP c1823d or C1823A color cart.

you musn`t have a coulor printer

short answer: no

Clean the cartridge contacts and the printer contacts as shown here.

Regards,
Bob Headrick, Microsoft MVP Printing/Imaging

This is usually a sign that you are either running out of ink or have run out of ink

Assuming you have successfully eliminated cartridge/print head problems, the only other thing to try is to delete the printer software and reinstall [Start/Printers and faxes -right click on the printer icon click delete- install new printer -Have the software disk and handy or select from list- select maker, select model,] I suspect the problem is still print head/cartridge however