This thing was working fine when I had it in my car then I switched to a Sundown 1500d. I hooked the amp up after it had been sitting for 2 months and it came on in protection. Its been sitting every since ( this past summer) collecting dust in my garage so $75 takes it shipped!!. I took a look at the board but I saw nothing wrong( I know nothing about the inside of an amp). Links to my old thread with pics of the board. http://www.caraudio.com/forum/showthread.php?t=353903&highlight=pca2000d