A4000 wont boot after replacing caps

[jaymanu]

Hi to all amigans !
It's the first time i'm posting here.
Here's the story :
I  live in Paris and I couldn't resist when I saw an A4000 complete with  its 1942 monitor, pickable near me on ebay. Was a child dream, as I was  an A500 then A2000 user as a teenager.
It worked good, i upgraded the ram and roms. I also put a cf card, dvd rom, and network card.
But  after a while, it began to show its age, having crackling audio and  unstable video. So i disconnected everything from the motherboard and  sent it for caps replacement to amigakit in england. I have very little  soldering skills, but wouldnt dare to put my hands on this vintage item  
It took quite a long time, but it went back to me with amigakit "QC passed".
Now  i resettle everything, and sadly it doesnt boot. I got red screens so i  suspected the roms and bought new ones. Now i can only get gray, or at  times purple, screen. The disk drive is not reacting. I did the  caps-lock test, it blinks 6 times then sticks off.
Could this be the  CPU card ? I kept it and didnt send it with the MB. It's a phase 5  cyberstorm carrier with a 040 CPU. Or maybe the RAM ? With the chip only  or even all slots empty, i get the same results.
Do you have any  clue ? Do you think something went wrong when they fixed the board ? Or  maybe there's a jumper setting that i missed ?
Thanks in advance !
JM

[jaymanu]

well both clocks are set to EXT, which is how the cyberstorm manual tells to set them.
I also tried both rom speeds, without success.

[jaymanu]

Hi !
Thanks for these quick and quite complete replies !

Well yes i tried with no RAM and both INT and EXT.
I'm not sure though which romspeed i should select, i thought the longer the safer.
I checked the voltages and i get 4.8, the 12v is quite good too.
I'm not sure (shame), but I think the 40 is a 40MHz one, the crystal says 80 so I guess there's a divider.

Thanks for the link, I don't have this same board but i'll try pressing again everything again, specially the CPU. I sprayed contact cleaner in the big connectors between MB and carrier, and between carrier and CPU.

I didn't also leave the system on for an hour, i'll do that. I'm pretty scared of turning the power on and off very repeatedly will all my tries..

I'll keep trying and tell you if I manage to get the green flag

I don't know anyone in paris hacking amigas, so trying another CPU module would be quite expensive..

I'll let you know, thanks.

JM

[jaymanu]

Hi !
I'm back from holidays and trying again with your help.
I'm now having the machine powered on, will wait an hour to see if anything more happens. I measured the output voltages from the power unit, i'm reading 4.9 and 11.88V : does that sound enough ?
I removed all the RAM and nothing happens on screen. The caps lock still blinks 7 times before dying. So nothing really new nor positive for now.

... unfortunately after 3 hours i'm reading the same voltages. They seem to be enough so I have to fear something else is dead