Amiga 500 no display no boot

[Oldsmobile_Mike]

Electrical contact cleaner?

Also try just pressing down on the Agnus chips first, although if you really want to remove them you can pull the motherboard and press them up from underneath (carefully!).

There's an old story that Commodore techs used to just drop the machines from an inch or two up to reseat the Agnus's,  because a speed bump at the plant would knock every one loose on its way out.  

[Oldsmobile_Mike]

Agreed, definitely leaning toward the chip ram or the caps, but since you've got another one coming save them for parts at least!  Oh, and you'll love the GVP controller, I just posted a link to where you can get 8 MB of memory for it for $11 with free shipping, off ebay, over in the marketplace forum.  Lots of cheap upgrades you can do on an A500: throw in a 68010, ECS chipset, 3.1 rom, do the 1MB chip ram hack, all for under $20 each.  Love 'em!  You'll be able to use WHDload to get just about any old game you can think of running on this kind of machine, just watch out you don't start staying up till 5am messing with it, like I do mine.  

And also I recommend checking out the Indivision ECS, it's about $100 from AmigaKit but will allow you to use any modern LCD monitor or TV for your display, and adds a bunch of new high res graphics modes.  Have fun!