Hello,

  Did you perform a factory reset on the unit?  If so, you will need to take the unit to a service center for diagnosis and repair.

See the following links for more information:

Amp Troubleshooting

http://line6.com/community/docs/DOC-4488

Factory Reset Procedures for Line 6 Gear

http://line6.com/community/docs/DOC-4499

Product Repair

http://line6.com/community/docs/DOC-4285

Hello,

Unfortunately, the factory reset is really the only troubleshooting you can do on your end. This sounds like an internal hardware issue so contacting your local service center would be the best thing to do at this point.

Line6Miller

I have the exact same problem with my AX2 (started about 2 years after I bought it). The amp has been collecting dust in my parents' basement for the last 4-5 years. Would be really nice if someone knows how to fix it since it hardly serves as a practice amp in this condition...

some additional discoveries:

* Sometimes it works fine for several days and other times it is completely useless

* I have found out that if I punch on top of the amp really hard, a very loud noise comes out and then the gurgleing noise stops for the moment (does not work every time though). A few minutes later it's usually back. This led me to the conclusion that perhaps the problem is an intermittent connection (glitch?) inside the amp. So I handed it in to a service technician (a friend of my dad who usually fixes tvs and stuff). He didn't have any previous experience with digital amps but at least he was more qualified than me. Unfortunately he couldnt find anything strange about it.

Hello,

  A weak battery will usually give an indication in the display ("Lo Bat"), and the normal symptom is the amp will not save or recall stored presets. See the following link to contact a service center, and see if they are able to take the chassis via mail if you are not able to drive the unit to the repair center.

Product Repair

http://line6.com/community/docs/DOC-4285

Hard to contribute more to this.  First off, these amps are no longer supported by Line 6, so there is no owner who carries a warranty.  Line 6 support is pretty good about sending various components for free (they no longer have the processor chips or PC boards, but I've still been able to get replacement pots from them - the AX2 have a long D shaft pot that are hard to find "off the shelf").

Most intermittent problems get resolved from the unplug/replugging all of the internal wire/ribbon connectors.  Poor sodder connections are nice to look for, but quite tedious and difficult to find.  The battery really only saves and holds the user settings, not the performance of the amp.  Do these symptoms happen in both the user and preset mode, or only one?   I recently had major problems with the user bank on one of my AX2's.  In my experience, when the amps are "factory reset", the user banks are filled with their alternate preset bank (U01=P01, etc.).  For some reason, my user bank didn't fill with anything, so when I switched to the user bank, I'd get this screaming, oscillating noise.  I remedied this by filling every user slot with one of the presets.  Have had no problem since and can freely edit the user banks to my own custom settings.

I've had a number of these amps over the years (currently have two - both converted Axsys 212s).  Several have had a static, scratchy distorted sound that seems to build into a crescendo.  The "whacking" the top of the amp cleared this, but as you notice, not permanently.  Never really found a cure, usually it just went away.  In the past when I played them live (I now use a Variax and POD XTL) I had converted them into heads.  I would bring both heads and one cabinet and if one of the amps had a problem, I could shut it off and switch to the other.  What model do you have - Axsys converted to an AX2 (will not have the heat sink fins on the back, has a green "6" on the grill logo and the speaker labels are black) or an AX2 (fins, silver "6" and red labels).  If the former, there were a number of service upgrades that tweaked performance until they eventually came out with the AX2.

Hope these comments are helpful.