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MA Audio's website has the recommended box volume and port size online here. A ported enclosure needs 3.0 CuFt of internal volume and the port should be 48 sq/in and 14.5" in length. A 4X12" rectangular port would give you the recommended 48 sq/in. Using 3/4" MDF, a box 16X18X25 has an internal volume of 3.25 CuFt allowing .25 CuFt for the sub and port displacement.
Make sure the plug is all the way into the AC adapter. Then, you will need someone to verify the output of the AC adapter. You should have a 16VDC and a 32VDC output from the adapter. If that is good, you have an internal problem with the printer. If the output voltage(s) are missing you will need to replace the AC adapter.
Here are the specs:
Input voltage: AC 100 to 240 V ~ 1 A 50–60 Hz, grounded
Output voltage: DC 32 Vdc===940 mA, 16 V===625 mA
HP part# 0957-2146 Call 1-800-227-8164 for availability.
The problem with your TV
might be the convergence correction amplifier modules (2 STK392-110).
These modules often malfunction and produce the symptoms you are
describing. The cost of the parts is about from $12.00 - $32.00
depending where you buy the parts from. The major cost will be the
labor, and if needed the cost of installing the biasing circuitry that
the modules use. This usually costs around $200.00 - $400.00 depending
on the shop.
Getting rid of it might not be warranted if you can spend the 200-400 to get it repaired.