If you’ve recently found yourself unable to print to your HP printer or perhaps had messages pop up warning you that HP software is malware and will damage your computer, you’re not alone. Over the weekend, at HP’s request, Apple revoked the security certificate that enables the HP software to run on your computer. It’s not clear at this point why HP requested this or if they knew that it would break so many users ability to print.

You can read more at The Register

While you will have to wait for Apple and HP to sort this out for your drivers to work again, you can probably get your printer working in the meantime by using the AirPrint drivers. If you need help with this, get in touch.