I always start at the psu. Are all the voltages good?
Check the motherboard connector.the yellow +5 pin is known to corrode as if its been hot and not make contact. sometimes the motherboard female pins spread also causing a no/bad contact problem.
Assuming they are ok,i check all the jumpers. Its a good idea to move the motherboard jumpers on their pins as i have had tarnished ones not making good contact in the past. Verify they are all in proper default positions.the INT/EXT motherboard jumpers should be set INT on both for the warpengine..
Check the jumpers on the warp engine and make sure you have a scsi hd hooked to it with proper termination.from memory it will still boot just fine w/o a hd,but i want to be sure i tell you right and a drive present is a safe bet. Jumpers are here:
http://amiga.resource.cx/exp/warpengineOne wrong jumper somewhere can cause no boot and ruin your day.
Pay particular attention to ram and if possible stick 4 good simms preferably of the same size in the warp engine and set the jumpers accordingly.(ram only need be in 2 proper sockets technically,but using 4 eliminates any question of which sockets to use).
install the warp engine(be sure its fully seated) and power up.Keep in mind if no ide drives and floppy are present,3.1 roms delay boot a long time.
if this still is not working,you might try swapping the 3x roms from socket to socket,they may just be in the wrong sockets.verify they are A4000 roms, i have had 4000's where people installed A1200 roms etc.
look at the battery area for corrosion on nearby chips for damaged traces.
if that is ok, it could be caps leaking. i have fixed a good few boards that had traces eaten that run under some caps.removing caps and checking for continuity on traces that run under is a good idea before installing new ones. they are notorious around the audio circuit.
Still no go? If it helps i am in texas and could be willing to take a look at it as a last resort. time is short for me always but i will try and help.
meanwhile it would be a good idea to have a known good kbd, the suggested flashing caps key check is useful. you can adapt a 2000/3000 kbd with a common pc din to ps2 adapter if you have one.
Good luck
Mech
