envy 5530 E Cannot detect alignment page

[Richlw46]

I am setting up a new HP Envy 5530 e-All-in-One Series printer. I went through the installation OK, until I got to the part about aligning the print cartridges.  It's printing the alignment page, it will even copy it, so I know the scanner is working. I've printed several pages and they all look good.  But when I use the print cartridge alignment tool it fails to detect the alignment page in the scanner. 

Yes, it is face down on the scanner

Yes, the cartridges are installed OK

Yes, the print looks good

Yes, the scanner can scan and print pages, even the alignment page

What else to try?

Thanks

[Richlw46 · Accepted solution]

Well, nevermind. I unplugged it, moved the plug to a regular wall socket instead of a power strip, and it turned on, asking to do a print alignment.

I did, it printed the page, I put the page on the scanner and it completed the alignment. 

I don't know what the problem was earlier, but it worked this time.