No problem. just bought it and a pair of thump 15s what cables are best. and we want to play our accoustic gigs through this and dont know how to set eq i know its different each room but a starting point.

When I play with '60s bands and blues bands I tend to use flatwound strings to get an authentic 'thump'.

Otherwise I use Elixir Roundwound - good luck

Prices vary widely for those, from say $500 to $3000. You had best get an appraidal from an expert.
.

Your best bet is to contact Mackie Tech Support. Here is a link to their Suppot page. Mackie Tech Support
it's likely it needs to go to a repair shop. Here is a link to their service center finder. Mackie Service Center Locater

does the speaker still work? use a 9 volt battery and do a test thump to see if the horn and woofer still work...when the power amps on these units fail most of the time they shut down.

Check instrument cable, cable jack on guitar, cable jack on pedal. If pedal has gigged much, the last is most probable

Whether you are experienced in electronics repair?
if not, try this simply way:
1: Test whether the power amplifier is still working. See figure 1.
Power OFF,adjust the EQ settings as shown in the picture.
Minimize LEVEL.Switch ON Power. Touch pin 3 at the INPUT socket by using a small screwdriver or piece of wire / cable.
Slowly raise the LEVEL,a little bit only (as the clock showed 7-8) until
sound is heard in speaker. If not heard, slowly raise again LEVEL.
If audio input signal is heard,it can simply be taken to mean
that the amplifier is working.
If LEVEL at 9 o'clock position,and the audio is not heard,
the possibility of the amplifier is damaged.
Switch OFF the power. Take it to a repair place.


2: When the Power LED is lit, but no sound,
There are many possible causes, one of which is:
I have been getting 3 times similar cases, and all are caused by
two Rectifier-Diode (either or both.) damage on the power-supply-unit.
Remove/desolder,measure, if damaged replace it with a new one.
See figure 2-3.




Hope it helps. Regards.

...............

The internal amp is in need of repair. Are there any other symptoms or signs?

to get the best from this mixer output wise, you need to use 4ohm speakers rated at 150watts each. The 200 wat rating is at 4ohms. You can use 8 ohm speakers, but they recomend speakers at 70watts.

Gig wise, you could do a small location that will cater for about 40 people, but that would be pushing your system to the max.

Maximum possible set up? well there is a way to work most scenarios you are given, but it is not best practice.

Ideally, you know what instruments and vocals you want to go through the system, a rough idea of the size of venues you wil play and then ask questions on a system to suit.

With a stereo splitter cable that takes the stereo 1/8 plug of the computer into two RCA plugs you could go into the "Tape Input" of the mixer... OR take a 1/8 stereo splitter cable from the PC splitting to a pair of 1/4 inch plugs go into one of the 4 stereo input pairs on the mixer... like 7 and 8 or 9 and 10 for example.

You need to search for a service that can "recone" speakers... However, you might be better to just replace the speaker in the cabinet. A 10 inch speaker is not that expensive.