Coombs' test involves taking a blood sample which is checked for the presence of antibodies which may destroy red blood cells.
You can use the HP Print and Scan Doctor to test the status of the printer spooler, print queue, device manager, and device conflicts. 1  On the desktop, double-click the HP Print and Scan Doctor icon to open the tool. 2  Click Start on the Welcome screen. 3  Select your printer, and then click Next.  Click Fix Printing.
A new scanning technology, HP TopShot Scanning, captures six images of a document or 3D object and combines them to create one high-quality image suitable for print or Web. The first printer with this technology, the HP TopShot Laserjet Pro M275, is coming soon for $349.