Macbook Pro doesn't find specific IP-adress printer

I have a weird problem. We have a MacBook Pro 5,5 (early 2009 - 13 inch - Apple/Toshiba 128 Gb SSD - 2x2 Gb memory) and a Canon IR-ADV C5030 copier/printer combination on a network. The Macbook has always worked flawless under OS X 10.5 through 10.9 Mavericks. The Canon copier is attached to the network on IP-address 192.168.1.11. Untill 2 weeks ago the Macbook printed without any problem on this printer, but then suddenly the MacBook could no longer detect the Ip-adress. The other 2 printers on the network (IP 192.168.1.7 and 192.168.1.9) are detectable and usable. Also the 2 servers present no problem. All the other computers on the network can see and print to the canon copier. From this MacBook using the Networking utility and trying to Ping the printer results in 'No route to host. Host is down'. Pinging from the other computers to this printer give good results...
I tried the following (without any result):
- First all the usual updating of system and Canon drivers and resetting (PRAM). No use...
- Reformatted the SSD and reinstalled everything again from TimeMachine Backup. No use...
- Started up from an USB-stick with OS X 10.9 installer on it. Reformatted the SSD. Did no installation of OS X on the SSD. Pinging 192.168.1.11 gives the same results as above!
- Removed the SSD and 1 memory module (2 Gb) - Restarted from the USB stick. Same results...
- Started up from USB-stick with OS X 10.8. Same results...
- Installed system 10.8 on the SSD. Installed TechTool pro 6. Ran all the tests. No problems except hanging on the SMART Check configuration but this can be due to being an older Techtool, I guess.
Does anyone have ever encountered a simular problem? Is this a hardware problem? And what is the solution to this problem?
Any help would be very appreciated! Thanks!

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a Fusion Drive or a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Try to ping the printer while in safe mode.
After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of the test.

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