I have a TX-8211 but I am out of town looking at Internet Radio tuners. Can you tell me what type of inputs are on the Onkyo? I know it has the black/red spring loaded wire inputs but are there other types? Which input would give me the best sound? Thank you

Why not enter the info into a search engine? Or try their site . . .
SEARCH ENGINES ARE YOU FRIEND!!!

The manual for the tx-8211 says that the total impedance for when you have both A and B speakers on are 8 ohms before it goes into protection mode. So look on the back of the speakers and read the impedance and add them up for that side of the speakers. You can wire them in series and it should fix them. I know this is a tad bit late by yknow two years but I’m bored and have nothing else to do.

Check all of your speaker wires and speaker turminals. I bet there is a short.

Eliminate the short or overheating problem it thinks exists. Disconnect all speakers first to see if one of them is the culprit. If it's internal, take it to a shop.

It's unlikely you can. Most hifi shops can though.

If you're still reading, open it up, and look for a switch of some kind. It may not even exist, but I'd say it's the best thing to look for when doing something considered mediocre at hifi shops (if it was difficult and interesting, they wouldn't find it so boring). Maybe it's a button. It will probably be labelled protection or reset or something similar.

So, look for a switch, or something similar. I have no idea where it would be because I've never dismantled such a thing. The other option (if you haven't done so already) is unplug it from the power and leave it for a while (overnight may be the best bet). This may fix it for you, and it's easier than undoing all those screws.

I realize you may have already doubled checked but make sure you follow this from the manual:
If the satellite tuner / cable box is equipped with an S video output
terminal, connect it to the S VIDEO 3 (or 4) IN terminal with an S
video cable. If it does not have an S video output terminal, connect
its video output terminal to the VIDEO 3 (or 4) IN terminal using an
RCA-type video connection cable. You do not need to connect to
both the S VIDEO 3 (or 4) IN and VIDEO 3 (or 4) IN terminals. If
the satellite tuner or television has component video outputs,
connect them to one of the COMPONENT VIDEO INPUT jacks.
With the initial settings of the TX-DS898, the VIDEO 3 and
VIDEO 4 input sources are set for the COMPONENT VIDEO
INPUT 2 jack.
If the video connection is made at COMPONENT VIDEO INPUT
1, this must be changed at the Setup menu: Input Setup → Video
Setup → Component Video (see page 35).
Using an RCA-type audio connection cable, connect the audio
output terminal on the satellite tuner or television to the same
VIDEO 3 (or 4) IN audio jacks on the TX-DS898. Make sure that
you properly connect the left channel to the L jack and the right
channel to the R jack.
If the device has a digital output jack as well, be sure to also connect
it to either a DIGITAL INPUT (COAXIAL) or DIGITAL INPUT
(OPTICAL) jack on the TX-DS898 depending on the device.
With the initial settings of the TX-DS898, the VIDEO 3 input source
is set for digital input at the OPTICAL 3 jack, and the VIDEO 4
input source is set for digital input at the OPTICAL 4 jack.
If the digital connection is made at a different jack, this must be changed
at the Setup menu: Input Setup → Digital Setup (see page 33).

I woud examine the front panel indicators very carefully. Think about what your other inputs are that don't work. Besides all being from external components, are they non-stereo, or non analog, or ? What's common to them? The Multi-Channel function (button 5 alternate function on the Remote) would be a wild guess since on my Pioneer it overrides every other input. Not sure how the onbiard tuner is affected since I don't use it andI'm out of town for a few days or I'd try it.

It's the Tape 2 button - unclick it.

Make sure your receiver is hooked up to proper AM and FM antennae. Try switching to AM, scan stations. If you hear AM static and/or weak signals the problem could be antennas are not hooked up. FM has AFT which blocks out weak or noisey stations and you wont hear anything without ant.

You can download the manual from the link below: http://63.148.251.135/redirect_service.cfm?type=own_manuals&file=TXSV414PROom.pdf Please update the question & let us know if the information given was useful to you - Good Luck!