If you have a Blue Screen / Error due to Wireless issues (B110a), fix in here.

Question

For the original thread created by somebody else, please see here:
http://h30434.www3.hp.com/t5/Printer-All-in-One-In​stall-and/B110a-network-connection-problem/m-p/319​...
Here's a youtube video of what happened to me: http://www.youtube.com/watch?v=adE1kq36ld4
I'm reposting it here so it can hopefully help some of you guys if anybody else stumbles across this. In short, my printer was fresh out of the box and I attempted to connect it to the wireless network. It would throw a blue screen on the LCD with an error of B8126AD6.
I narrowed it down to an issue with DHCP. For some reason the printer connects to the wireless access point but as soon as it tries to get an IP address from the DHCP server it crashes with that blue screen and the error code in the first post above. This look like a massive bug in the printers firmware! For reference my router is a Billion 7401VGPR3 which is acting as my default gateway and DHCP server. I have a Linksys WRT54G as my Access Point for the house. 
To solve it, I turned DHCP off on my router and then tried connecting the printer to the wireless network. This time it connects fine but you still can't talk to it because it doesn't have a proper IP address. If it still doesn't connect properly, try turning WPA/WPA2/WEP off on your Access Point. Leave it completely open for a moment until you can reach the web interface (as below). 
To fix the IP issue, I then went into the Settings menu on the printer and printed the "HP Network Configuration Page". Note that under the Wireless menu option there are a couple of different "Print Network Test Page" options. I believe it's the 2nd one that I selected. You'll know you have the right one when it prints out the page with the following info:
IPv4 IP Address
Subnet Mask
Hostname
Default Gateway
Primary DNS
etc, etc.
Take note of the IP Address from the printout above and the Subnet Mask. My IP was 169.254.73.5 and subnet mask 255.255.0.0. Now I manually configured my computers IP address to be similar (within the same subnet): 169.254.73.10 with the same subnet mask.
Now you can load up the web interface of the printer using http://169.254.73.5 in my case. (You should also be able to ping the printer at this point too). In here you have a Network tab where you can now manually set the IP Address of the printer. Set the address you want it to be in your network (in my case 192.168.0.3 with a subnet mask of 255.255.255.0 and default gateway 192.168.0.1 and dns server 192.168.0.1).
Once I clicked OK I changed my PC's IP back to normal, and I can now reach the printer on its IP address set above. YAY!
The great thing is, in the web interface you get a million more options to play with. You can manually set the IP address, gateway, DNS, wireless settings such as WPA1/WPA2 AES/TKIP Encryption, WPA Passkey, etc. So if you had to set the Access Point to completely Open, setup the encryption again and put the passkey in here. When I did this I had to go back into the Settings menu on the printer LCD and select "Disable Wireless" then "Enable Wireless" to force it to re-join the network.
Finally I went into the Settings menu again and Updated the software on the printer. I don't know if the new software fixes the bug or not - I haven't tested it (can't be bothered!).
Hopefully this will help some of you guys out there too!
EDIT: I've just stumbled across another couple of posts with similar results to mine:
- http://h30434.www3.hp.com/t5/Printer-networking-an​d-wireless/How-to-install-Photosmart-B109n-z-on-a-​...
- http://forums.techguy.org/networking/627989-hp-698​0-printer-wireless-problem.html

Answer 1

Many thanks to gardz for an exhaustive overview on this critical problem with the B110a printer!
I am happy to report that I have managed to set the printer to a static IP and am now able to connect to it wirelessly from my home computers, and also able to use the web apps and ePrint features on the printer. The printer shows the IP address and I am able to use the EWS (Embedded Web Server) to connect to its IP address from my PC's internet browser. The Wireless Network Test Report also showed no problems. I have also completed the Product Update on the printer, and there are no more pending updates now.
However, the core wireless problem is still not satisfactorily resolved.
I get the BSOD and blinking-lights error ("Please turn off printer and then on"), only if I start the printer when Wireless is enabled on the printer. If wireless is disabled prior to printer boot, there is no error. 
The workaround I have adopted for now, is to always switch off the printer's wireless, before switching off the printer, and enabling the wireless setting only when I need to print/scan.
Is this happening with anyone else? Why would the printer crash if it boots with wireless enabled? If it is already set to a static IP, why would it still conflict with the DHCP on the router?
My router is perfectly working, it is in the same room as the printer, so the signal strength is good. The printer itself is quite stable except for this crash-after-boot-if-wireless-was-enabled issue on the printer.
I made the mistake of connecting the USB cable to my primary computer before installing the printer drivers, so even the USB option is not working (Windows recognizes the printer as an unknown USB device). If anyone can point me to the printer drivers (inf files), I would be grateful. The CD does not have the driver files in a convenient location. It seems to be embedded within the setup package somewhere.
Gardz and PrintDoc, I hope you can help us out on this one. I know many B110a users are struggling with the wireless issues, so HP needs to release a firmware fix and driver update soon. Wireless ought to work out-of-the-box, as this product is aimed at the SOHO users.