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Now – since this modification is a bit more work than the Intellivision mod, and since there are no live 120VAC wires inside the console to worry about, and since this console is such a pain to assemble and disassemble, it's probably worth hooking it up now to make sure it works before buttoning everything up.   If all goes well, you should have a nice, bright picture and sound on your TV set.  If not, make sure you're getting +12V to the video-amp board, then double-check your wiring.

Actually, double-check that you have the cartridge inserted correctly, and that the connectors aren't dirty or corroded, too.  Without the top half of the case to help position the cartridge, it's easier than you think to miss the edge connector completely.  (The Colecovision should prompt you to turn it off and insert a cartridge in that case, but you never know...)

If all goes well, you're ready to reassemble the unit.  "Installation is the reverse of removal", as the old lie – er, saying goes. Reattaching the silver-and-black sticker to the front of the console is left as an exercise to the reader – I, personally, just used some double-sided scotch tape, which seems to hold well enough.  A couple of thin smears of silicone along the edges would probably do the job too – just keep in mind that you might have to reopen the console someday, so you don't want to use anything too aggressively permanent!  (In other words, superglue, epoxy, and Gorilla Glue probably aren't your best options here.)

Ahh, more blocky 8-bit goodness to revel in... Actually, the Colecovision had the best graphics of any of the "first wave" console systems, by far; and since it used the same sound chip (the SN76489) as many of the arcade games that Coleco had licensed the rights to, the home-console versions often sounded exactly like the arcade original.  Had Coleco stuck with their original plans for the Super Game Console expansion module, which would have expanded the system's capabilities even further, they might well have been the dominant console of the 1980's.  Unfortunately, they got lost in the fever swamps of the ADAM Family Computer System boondoggle instead, which drove the company to near-bankruptcy and, coupled with the general video-game bust of the mid-80's, left the door wide open for Nintendo to move in and take over the console market with the NES.