I think this is quite important. Your computer shouldn't need several power cycles to turn it on. So I'd fix that problem first, and then try it with the Blizzard card attached. Sounds like a capacitor problem on probably motherboard and PSU being as they're all so old now. There's also the reseating of the motherboard chips where possible.
I have a flaky A600 which sometimes GURUS on power on, and I suspect it needs new motherboard caps. Problem is I'm at the same time trying to test a memory expansion I bought for it recently that seems to work, but after a guru, I reboot and the memory disappears and I have to powercycle again, which sometimes doesn't always work and I get either a white screen continually or yellow/green, or a black screen which goes all weird and "out of range".
So definitely fix your motherboard issues alone first, as it may well be causing the blizzard to not function.
Might have to check the capacitors though I hope they aren't bad. I'm not 100% sure if I can remove and replace them myself without causing any damage. I wonder how easy it is to test/replace them? It looks a lot easier than modern stuff whereby capacitors are the size (almost) of a full stop!
Well I got the PC power adapter eventually and I can say I've managed to advance forwards - slightly. I used the hard drive card (which was in the A2000 when I bought it) and the blizzard card inside the A2000. I was using the hard drive card so that I could at least have something which would boot to WB.
With memory installed in the blizzard card, no joy. Stuck at white screen. Without memory in the blizzard I got to the WB screen though the amiga acted very oddly. It loaded up to WB, but the mouse pointer was completely missing and I had a ludicrous amount of memory free (in the order of about 30 to 40K free).
I also removed, cleaned the socket (best I could) and reseated the 5271 chip (which I found out was the buster chip). Put the blizzard card back in with memory installed back in the blizzard but this time removing the hard drive (Since the blizzard card has a SCSI controller I was thinking *maybe* there's a conflict between it and the hard drive card that was originally in the amiga). More success this time -- although I had no WB to boot to, I got the purple incert disk animation the amiga gives you if it can't boot. Even had a mouse pointer too!
Still trying, right now its gone back to stuck at a white screen again x.x
****UPDATE****
I might be having possible success. After trying various jumper settings (and after finding an old WB3.0 bootdisk) I managed to get to the WB screen again though it took many power cycles. I say success as the system is reporting a large amount of memory -- there's 32MB (2x16MB) on the blizzard card in 72 pin simms. WB reports 975536 graphics memory but 32844352 other mem. That *looks* like the 32MB showing up. In theroy if that's there then (again it is just a theroy) prephaps there is some life?
Just for information purposes btw, here's all the jumper settings I'm using. O the blizzard card -- eclock=open, cclock=closed, maprom=closed. On the A2000 mother board J101=2,3 J900=closed, J300=2,3 J301=open, J500=open.
In the blizzards' manual it mentins cclock being closed though I don't know what cclock (or eclock) do exactly.
Can't tell if the CPU is working at this stage. Though the memory is doing something......
ljones