Epson Workforce 500 and HP  OfficeJet Pro 8500 - "Printer Offline"

This week I downloaded an Epson printer driver update from Apple's Software Update. I use an Epson Workforce 500 with my Mac Mini computer at my office. Since installing Snow Leopard originally I had experienced no problems with the printer but assumed that if Apple was telling me to install a driver update, I should do so. Big mistake!
After installing the driver update I was unable to print anything. When attempting to print a page from Safari or MIcrosoft Word, everything initially seemed ok, until I saw my printer icon bouncing in the Dock with a yellow symbol indicating "Printer Offline." After searching the Apple site and various discussion boards I spent an entire afternoon attempting all of the recommended fixes with no results. Since I cannot operate my business without a printer, I decided to simply purchase a new printer hoping that this was simply an Epson problem.
I am now the proud owner of an HP OfficeJet Pro 8500 Premier All-in-One. Unfortunately I am still suffering from the "Printer Offline" message whenever I attempt to print anything. After spending another afternoon on the phone with a tech support person from HP, I am still unable to print. I have done all of the following:
Disconnected and reconnected all cables between the computer and the printer.
Switched the USB cable to a different USB port on the computer.
Restarted the computer and the printer.
Unplugged and replugged the computer to reset it.
Checked to confirm that the printer does show up under USB on the System Profiler.
Deleted any old print jobs in the print queue and made certain that the printer was not in pause mode.
Tried to print from various programs with the same result.
Although this printer does appear in the printer list, deleted it and then added it again under the Printer and Fax area of System Preferences.
Uninstalled the HP printer driver, restarted the computer, downloaded HP's latest driver for this computer from their website under the instruction of HP's tech support person and reinstalled this driver and again performing all of the above.
Repaired disk permissions several times.
Reset the printing system under the Printer and Fax area of System Preferences.
I have been unable to find any further possible fixes in any of the discussion boards either on the Apple or the HP site. After doing everything listed here the HP tech support person felt that the problem must be with Apple rather than HP since the problem developed initially after the Epson printer update and then occurred with both the Epson and the HP printers.
I have an appointment later today with an Apple Genius at my local Apple store to see if I can get any advice. Any suggestions from anyone on this board would be greatly appreciated since I do need my printer to carry on in my business. At this point I am desperate to the point of considering the replacement of my computer but am hesitant to do so suspecting that the new models should be released soon.

HI and Welcome to Apple Discussions...
Try downloading and installing the 10.6.1 combo update. It's OK to do this even though you are already running 10.6.1. One of the "fixes" .. "some printer compatibility drivers not appearing properly in the add printer browser"
http://support.apple.com/kb/DL930
Make sure and repair disk permissions after the installation.
Quit any open applications/programs. Launch Disk Utility. (Applications/Utilities) Select MacintoshHD in the panel on the left, select the FirstAid tab. Click: Repair Disk Permissions. When it's finished from the Menu Bar, Quit Disk Utility and restart your Mac. If you see a long list of "messages" in the permissions window, it's ok. That can be ignored. As long as you see, "Permissions Repair Complete" when it's finished... you're done. Quit Disk Utility and restart your Mac.
Always make sure your Mac has sufficient disk space available.
Right or control click the MacintoshHD icon. Click Get Info. In the Get Info window you will see Capacity and Available. *Make sure you always have a minimum of 10% to 15% free disk space at all times.*
Carolyn

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