New guy to the site. Just spent an hour reading/searching for an answer to my problem; couldn't find one so here it goes: I have a '99 4X4 Chevy Suburban LT, 5.7L, auto, leather, 1st Gen OnStar with 179,000+ miles. I bought it at 3 years old with 50,000 miles and have driven it on some long road trips and it has never let me down. Now to my problem: Recently the Delco radio model 09354155 (AM/FM cassette, remote located CD) went from a minor static noise interrupt to full dead sound...pounding on the dash in frustration could cause it to return to normal, however, over the past week that hasn't fixed the problem ( I was thinking a ground/short wire somewhere???). Here's what I've done to trouble shoot. Checked all fuses, connections, grounds and replaced to head unit with one out of a '98 Silverado. Now, the radio will come on for about 2 seconds and fades away to nothing. I have searched for the mysterious amplifier under the dash, under the seats, in the rear and only found (and removed) the OnStar amp behind the glove box. I did find a small amp looking box in front of the rear wheel well inside the jack area, but it appears to have power and all rear speakers have power however the twitter in the driver's door appears to have a ground. My mechanic friend (yes it's possible to have a friend that is honest mechanic) thought there was an amp somewhere but wasn't 100% sure exactly where the thing was. Does the Delco radio require a good signal from the OnStar amp? Where exactly is this amp??? Should I can all of this and put in an aftermarket unit and deal with all that hassle. I have installed several units, so this does not faze me in the least. The funny thing is I only listen to talk radio mostly, except when the wife is riding along. I looked into a HD radio setup from Best Buy. Has anyone tried out on of these? Sorry for the long write-up, I'll probably catch some grief, however, this is really starting to bother me. Thanks in advance.