Cartridge replacement requires page alignment sheet that when run through as per instructions only gives a page alignment error and no printing is possible.

Have u recently changed ur ink cartridge ? If so the printer is printing an alignment page . Turn it off then on , so it prints the alignment page. load the alignment page on the scanner glass and press the "Scan" button to complete the alignment. Once the alignment has completed the alignment page will not be printed again until you change the next cartridge. See your user manual for details.

Issue
The instructions displayed on the computer screen during the Print Cartridge Alignment are incorrect. If the printed alignment page is placed on the scanner glass and the Scan button is pressed as instructed on the computer screen, the all-in-one will beep and the control panel display will indicate Busy . The all-in-one will not align the print cartridges.
Workaround
The instructions on the printed alignment page or the all-in-one control panel display are correct. Follow the instructions below: Place the alignment page on the scanner glass and then press the OK button on the all-in-one to complete the print cartridge alignment.

Hi,

Your printer is printing alignment pages, because the cartridge alignment was not completed since you replaced them. Follow the below steps to complete alignment.

1. Turn the printer OFF and then turn back ON.
2. Wait until the alignment sheet prints out fully.
3. Place the alignment test page over the scanner glass.
4. Press start color scan button.
5. The printer "power" light will start flashing, indication the alignment process.
6. After the printer stops flashing, turn off and then ON the printer.It will not print any test pages further.

We need to run alignment test every-time while we replace ink cartridges.

Regards
Riztech

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Printing with an empty ink cartridge may cause printer malfunction. U051 / U052
U053 / U059 The ink cartridge may not be set properly, or an ink cartridge not supported by the printer is installed.
Install the proper ink cartridge.

Make sure to install both the ink cartridges even when you set the printer to use only one ink cartridge (Color or Photo) in printing.
If one of the ink cartridges is missing, this error will occur. U075 / U076 The ink cartridges are not installed in the proper position.
Install each ink cartridge in the proper position. U140 An ink cartridge not supported by the printer is installed.
Install the proper ink cartridge. U161 / U162 A used ink cartridge may be installed, or the ink cartridge may be empty.
Replace the ink cartridge.

By pressing the OK button, printing can be done without replacing the ink cartridge. However, the remaining ink amount cannot be detected properly, so the function to detect the remaining ink amount does not operate. READ/WRITE MODE Since the memory card is currently write-enabled, printing is not possible.
Set READ-ONLY MODE ON. NO PHOTOS ON CARD Some images in the memory card may not be in a supported format. images listed below cannot be printed directly from a memory card. Print them from a computer.

- images edited on the computer
- images in a format other than JPEG or TIFF
- images with double-byte characters used in the file name
- images saved in a folder nested 4 or more layers deep INCOMPATIBLE CAMERA The printer cannot communicate with the connected camera.
Disconnect the cable between the printer and the camera to clear the error.
Confirm the following items and print again.

1. Confirm that the camera you are using supports PictBridge or Canon Bubble Jet Direct.
If the camera does not support either one, the printer cannot print directly from the camera.
2. Set the camera in PictBridge print mode before it is connected to the machine. This is required before printing for some cameras that support PictBridge.
Please refer to the camera instructions for more information about procedures required before and after connection to the printer.
3. There may have been no response from the camera for the prescribed time.
Re-connect the cable between the camera and the printer. WASTE INK NEAR FULL The waste ink absorber is getting full.
Press the OK button to clear the error.
Printing can be done until the waste ink absorber becomes full. If the waste ink absorber becomes full, please contact your local Service Center for replacement of the absorber and printer maintenance.

The waste ink absorber is a part inside the printer, which absorbs ink used in the cleaning operations, etc. CHECK PRINTER Turn the printer off, and remove the power plug from the outlet.
About ten minutes later, plug it in again, and turn the printer on.
If the problem is not resolved, the printer may require servicing. Please contact your local Service Center. HEAD ALIGNMENT ERROR Automatic print head alignment failed.
Press the OK button to release the error.
Check the followings and do automatic print head alignment again.

- Check if A4/Letter-sized paper is loaded in the auto sheet feeder.
- Check if the paper output slot is not exposed to a strong light source
- Print the nozzle check pattern to check the status of the print head.

If the problem continues, do manual print head alignment. LOAD PAPER If paper is not set, set paper and press the OK button. When paper is set, check each item and do printing again.

1. Confirm that unusable paper is not set.
2. Confirm that paper is set properly.
3. Confirm that recommended paper is used, and the number of sheets set in the auto sheet feeder is within the limit.
4. Cleaning the paper feed roller may resolve the error.

If the problem persists, the printer may require servicing. Please contact your local Service Center. PAPER JAMMED Remove the jammed paper.
If paper jam frequently occurs, check the following:

1. Confirm that no foreign material is inside the printer.
2. Confirm that unusable paper is not set.
3. Confirm that paper is set properly.
4. Confirm that recommended paper is used, and the number of sheets set in the auto sheet feeder is within the limit.

If the problem persists, the printer may require servicing. Please contact your local Service Center.

Error messages displayed on the LCD and how to handle them
When an error has occurred in the printer, the error / check message is displayed on the LCD.
Take the appropriate action to return to the normal condition.
Error / Check message How to correct CHECK INK
U041 An ink cartridge is empty.
To cancel printing, press the Stop/Reset button.
To continue printing, press the OK button.
After the printing finishes, replace the empty ink cartridge.
Printing with an empty ink cartridge may cause printer malfunction. U051 / U052
U053 / U059 The ink cartridge may not be set properly, or an ink cartridge not supported by the printer is installed.
Install the proper ink cartridge.

Make sure to install both the ink cartridges even when you set the printer to use only one ink cartridge (Color or Photo) in printing.
If one of the ink cartridges is missing, this error will occur. U075 / U076 The ink cartridges are not installed in the proper position.
Install each ink cartridge in the proper position. U140 An ink cartridge not supported by the printer is installed.
Install the proper ink cartridge. U161 / U162 A used ink cartridge may be installed, or the ink cartridge may be empty.
Replace the ink cartridge.

By pressing the OK button, printing can be done without replacing the ink cartridge. However, the remaining ink amount cannot be detected properly, so the function to detect the remaining ink amount does not operate. READ/WRITE MODE Since the memory card is currently write-enabled, printing is not possible.
Set READ-ONLY MODE ON. NO PHOTOS ON CARD Some images in the memory card may not be in a supported format. images listed below cannot be printed directly from a memory card. Print them from a computer.

- images edited on the computer
- images in a format other than JPEG or TIFF
- images with double-byte characters used in the file name
- images saved in a folder nested 4 or more layers deep INCOMPATIBLE CAMERA The printer cannot communicate with the connected camera.
Disconnect the cable between the printer and the camera to clear the error.
Confirm the following items and print again.

1. Confirm that the camera you are using supports PictBridge or Canon Bubble Jet Direct.
If the camera does not support either one, the printer cannot print directly from the camera.
2. Set the camera in PictBridge print mode before it is connected to the machine. This is required before printing for some cameras that support PictBridge.
Please refer to the camera instructions for more information about procedures required before and after connection to the printer.
3. There may have been no response from the camera for the prescribed time.
Re-connect the cable between the camera and the printer. WASTE INK NEAR FULL The waste ink absorber is getting full.
Press the OK button to clear the error.
Printing can be done until the waste ink absorber becomes full. If the waste ink absorber becomes full, please contact your local Service Center for replacement of the absorber and printer maintenance.

The waste ink absorber is a part inside the printer, which absorbs ink used in the cleaning operations, etc. CHECK PRINTER Turn the printer off, and remove the power plug from the outlet.
About ten minutes later, plug it in again, and turn the printer on.
If the problem is not resolved, the printer may require servicing. Please contact your local Service Center. HEAD ALIGNMENT ERROR Automatic print head alignment failed.
Press the OK button to release the error.
Check the followings and do automatic print head alignment again.

- Check if A4/Letter-sized paper is loaded in the auto sheet feeder.
- Check if the paper output slot is not exposed to a strong light source
- Print the nozzle check pattern to check the status of the print head.

If the problem continues, do manual print head alignment. LOAD PAPER If paper is not set, set paper and press the OK button. When paper is set, check each item and do printing again.

1. Confirm that unusable paper is not set.
2. Confirm that paper is set properly.
3. Confirm that recommended paper is used, and the number of sheets set in the auto sheet feeder is within the limit.
4. Cleaning the paper feed roller may resolve the error.

If the problem persists, the printer may require servicing. Please contact your local Service Center. PAPER JAMMED Remove the jammed paper.
If paper jam frequently occurs, check the following:

1. Confirm that no foreign material is inside the printer.
2. Confirm that unusable paper is not set.
3. Confirm that paper is set properly.
4. Confirm that recommended paper is used, and the number of sheets set in the auto sheet feeder is within the limit.

If the problem persists, the printer may require servicing. Please contact your local Service Center.

I just had the same issue (align page not detected).

We had just re-installed the empty color cartridge back into the printer (long story but basically we knew we could only print B/W).

The align page printout had a lot of empty spaces around the black lines. This is apparently where the color lines are supposed to print.

Without those color lines, the printer would not detect the align page as color is part of the alignment being done.

Since we only wanted black printouts, I pressed 'cancel' to stop the alignment process, and now we just hit the Black copy button and ignore the alignment prompt on the printer window.

The HP site (enter psc750 in product window) has some helpful ideas as to what the problem might also be. It could be the shipping tape is still on the new cartridge (and preventing the black or color from printing on the align sheets) etc.

the page should be absolutely new.and the scanner glass should be absolutely cleaned.and 1 main thing u replaced your black cartridge.but if your colour cartridge is empty it will not accept the allignment complete thing.it will show allignment failed as the particular colour is missing in your allignment sheet which is required to get the allignment complete.

Try printing a windows test page from the driver software, START-SETTINGS_PRINTERS-DELL964- properties,,etc. If the test page prints with color then I believe that your driver is set to print in greyscale. If you can't find that option in the driver you might try to re-install the driver from your original cd.