won't turn on

I have in my possession two Uniden BCD436HP model scanners, one is mine and the other is a friends. They have had their share of run time over the past year since we purchased them, but now they don't "run" at all...…….:( I can not get them to boot up and I have tried everything I can think of...

Hi guys. I hope I'm posting this in the correct section. I have made five VHF "extenders" for our low band system out of P110 portables. Three of them won't power up because they were installed without a "batter eliminator" voltage reduction circuit. Anybody know what component needs to be...