No longer able to print from wireless MacBook Pro to wired C7280

Question

I originally piggy-backed this onto an existing thread thinking that it was the same issue.  It looks like it was something else now, so I figured I probably ought to spin this off onto its own thread.
Details:
Printer:  Photosmart C7280 All-in-One, connected to network via Ethernet, IP address 192.168.1.5 (confirmed with Network Menu > View Network Settings > Display Wired Summary)
Router:  Verizon/Actiontec MI424-WR (Verizon FiOS) with
* Ethernet ports
* 802.11b and 11g with WPA encryption
Desktop:  iMac with Mac OS 10.5.8, Ethernet connection.  I originally installed the HP software from the CD when we got the 7280 a few years ago, but we've probably upgraded it since then.
My Laptop:  MacBook Pro with Mac OS 10.5.8, wireless connection.  I think the HP software was originally downloaded from hp.com (as opposed to the original CD).
Wife's Laptop:  MacBook with Mac OS 10.6.3, wireless connection.  HP software downloaded from hp.com.
We've been able to print from the laptops to the 7280 until several days ago.  After that, anything sent from the laptops stayed on the printer queue without any reaction from the printer, even after the usual tricks (cycling power on printers, holding and unholding jobs, pausing and unpausing printers, etc.) 
Our laptops seem to lose the wireless connection a bit more frequently than normal, and at first I thought that was the problem.  Lately, however, I can't get anything to print even when the wireless connection stays solid.  I can print from the iMac, though.
As noted above, my wife's MacBook has 10.6.3, so I'll try the instructions on other threads for uninstalling the HP software and using the built-in 10.6 drivers.  If I can pry the MacBook away from my wife long enough :-)
Meanwhile, I've been trying to troubleshoot my own MacBook Pro.  I can ping 192.168.1.5, and I can pull up the printer's web page by entering "192.168.1.5" in my web browser.
So I followed the instructions here:
http://h10025.www1.hp.com/ewfrf/wc/document?docnam e=c01893662&tmp_task=solveCategory&lc=en&dlc=en&c...
(title:  Mac OS X:  Print Jobs are Stuck in the Print Queue and Will Not Print on a Networked Product)
I followed Solution 1 (Delete and readd printer) until I got to steps 7 and 8.  The printer wasn't automatically added to the Printers list, so I clicked the Add button, but wasn't able to select my printer from the list.  Some of the information in Solution 2 seemed to hint that I had a connectivity problem, and suggested that I look for network connectivity solutions.  Unfortunately, all of the network connectivity FAQs referred to Windows-specific utilities, so I decided to uninstall the HP software (using HP Uninstaller).  I downloaded HP_Installer_PSC7200_v9.7.1.dmg from hp.com and ran it, but here's what happened:
At the Select Device step, no devices appeared even though the printer was powered up and on the network.  (As noted earlier, I can ping it.)  I checked "My device is not listed" and clicked Continue; when "Photosmart C7200 series" appeared, I selected it.
At the "Select the Device Connection" subset, I selected "Network." (The "device" in this question is the printer--right?)
I went through the Install step.
No device was listed at the Setup step.  I handled this the same way as the Select Device step ("My device is not listed", Continue, click "Photosmart C7200 series", Continue, select "Network", Continue.
This time, I got this dialog:  "If your device is not listed, it is not supported by this installer.  Please visit www.hp.com/support to download an installer, if one is available" even though this was the correct installer for C7200 and Mac 10.5.
Am I overlooking something?  What should I try next?
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Answer 1

It appears that the printer is OK and is on the network.  Eventually you may want to set a static IP address for it, but let's get things working first.
The first thing I would try would be to reset the printing system on all the problem Macs:
- Sys Prefs, Print & Fax
- Right (control) click the print queue area and select Reset Printing System.
- Select the plus sign to re-add it. Look for the printer, select it and wait until the "Add" button becomes available. Click it.
If this does not do it there may be something going on with the router.  I have a few ideas if this is required.  Let me know.
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