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Unfortunately, it sounds like it may need to go to an authorized service center for evaluation. You can start a Support Ticket first, in case there is anything that Line 6 can advise.

When you check/update the FBV, only it is connected to the computer. After that, you connect the amp to the FBV, check/update the amp, and use Spider Edit that way. The amp cannot be connected to the computer except by using the FBV.

Whether you can use the HD500x as the audio interface to ProTools depends on the version of PT you have - the latest version does not require using an Avid/M-Audio device.

Your kid's lucky to have a father who's accumulated this much gear for him to use! Whether its for at-home practice or recording, you won't be using all the gear at one time. Choose either the Eleven Rack or HD500x when you want to record electric guitar (or if for some reason you want to record the electric output of the acoustic guitar. Make the decision based on the sound(s) you want at the time. You may find one or the other of these redundant and seldom used. However, depending on what version of PT you have, it may only work with the 11-rack (or the M-Audio 410) as the audio input device. For recording mic or MIDI keyboard, the easiest choice would be to use the M-Audio 410 interface, although you can use a mic with the other gear - you didn't list any mics you have. Speakers - for jamming or loud practice, the Line 6 mixer and 3Ms would be the choice, otherwise the Samsons will provide enough volume to hear what's being played without blowing out eardrums or disturbing everyone else in the house. So, you guessed it, it means switching around cables every time, depending on what you want to do.

Everyone's sound ideas are different, and the guitar you use makes a big difference, too. I would advise using one of the included sound patches, or the manual modes, then adjusting the parameters to find the sounds you want.

You'd probably have to remove the amp chassis from the cabinet, and the jack may be hard-soldred to a board.

Start my connecting the FBV MkII to your computer with a standard USB cable, then go to Line6.com, download and install Monkey, thi sis the software that is used to update and install all Line 6 software. Next step is to check the kII for updates, then connect the amp to the MkII and have Monkey check it for updates. FInally, download Spider Edit - this is the patch editing software tha tis used on your computer to adjust sounds, save patches and install patches you have downloaded from the Line 6 user section.

Have you tried a new CAT5 cable? Also check the pins on both the pedal and amp - sometimes these can be bent out of place.

The MK I is the old version of the pedal that does not have computer connectivity. It will work with any of the Spider amps - I would not advise buying one, but if someone gave you one you could use it.

Unfortunately, old amps fail.

The link is to the product page for the Shortboard! That's what you asked about. What are you looking for? The manual is here: http://line6.com/support/manuals/fbvsmkii

If you want a clean acoustic sound, do not use any FX at all, or amp sims, in fact don't run it through Podfarm at all. What pickup do you have in your acoustic? Arguably, the best recorded acoustic sound is going to come from miking your guitar, not DIing it.

No, you need to do that manually through the selection button, or load the tones into the User banks.

http://line6.com/footcontrollers/fbvshortboardmkii.html

Napynap is correct. The patches are saved in the amp or Podfarm, not in the FBV, which is basically is just a switchbox.

What interface/input device are you using? Do you have the correct updated drivers installed for it?

You might want to change your post title. 'Emulation' is a way to make something "sound like ___". Sounds like you have no input signal. Have you tried a different guitar cable? Are you sure the guitar is working (battery check if there are active pickups)?

Yes, that is the way you would want to do it. You don't want to run the Spider amp with just one speaker output used.

No, you are getting the "full power" of the amplifier (note that 30 solid state watts is not particularly loud - not loud enough to play with a loud drummer, for example). The total volume of the amp is a combination of both the channel volume and the master volume. If you have the channel volume up high, then there is not much 'extra' available from the master volume as you continue turning it up. Think of it this way: maximum volume = 30. Channel x master = maximum 30. So if channel = 10, then the maximum you will be able to turn the master is 3 (10x3 = 30) - turning it any louder does not produce any more volume, although it may produce more saturation or noise. If channel = 6, then the maximum you can turn the master is 5, etc.

It would help if you linked to the sound you want.

Sorry, I am not sure what you have said - free translation software does not work well when it comes to technical things. Yes, using Spider Edit software (download from line6.com) and the FBV MkII you can adjust amp parameters and save patches to the User patch locations on the amp.

No change in tone when you manually change the settings?

Can you change the channels manually with the buttons on the amp? If so, then the problem woudl seeem to be in the amp-cable connection, or in the software. Unfortunately, due to the age of the amp, it would not beworth trying to get repaired.

Did you create a repair ticket for this? Line 6 techs don't check this forum.

Balancing the channel volume vs the master volume is an art. The amp has a maximum output, so if you have channel volume up very high, you will see little volume change as you increase the master volume. 'Drive' tends to add some volume, as well, but it simulates a saturation (like a tube amp) so as it is turned up, the sound gets more distorted. Similarly, the tonal properties will change depending on the overall amp volume - this is a property of not only the amp but the speaker as well. (highly-driven speakers sound different than those fed a low signal).