Yucky dscoloured box sydrome, will they show up on a professional printers?

Hello!

Much like other people I'm experiencing yucky discoloured box sydrome. Pretty much the same as other people here in that I'm saving my ai file as a pdf - no boxes around images. Then when printing the boxes appear! I thought my settings were off in ps so yesterday I uninstalled and reinstalled it and this morning recut out my images and saved at TIFF files. Placed in my ai file, saved as pdf and then printed and no boxes!!

However then in a new document the boxes started printing all over again. But I have no idea why!! I've read it's because the pritner I'm using doesn't work in printing CMYK, which is kind of ok as I'm only printing them out to see what they will look like. I'm actually getting them printed professionally so I'm wondering if I send the file I have with no boxes visable on the document on a professional printer will it print out correctly? Or will the boxes appear again.

If there's another way of cutting out images, saving and putting in an ai document for print then please let me know

I'm really at a loss and get confused easily with photoshop and general adobe language so any easy explanations are very welcome!

Thanks in advance!

🙂