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What software are you using to enable the G4’s cache?

Is that true?

It depends which revision of motherboard - some have two.

That was the right thing to do!

Check the Maxtor drive also has its termination resistor packs fitted.

They’re socketed - you can lever them out. Can you check continuity on your motherboard fuse - F3 I think it is.

Mine was worse:

It could be that one of those resistor networks on the hard drive PCB has gone bad, if op has a multimeter they could test them out of circuit. I don’t recall there being a termination jumper on that model.

If you’re cautious: try the DB25 and if that works then get something internal. If you’re impatient: go ahead and order something internal since it seems likely now that the issue is with the Sony hard disk rather than the computer.

You said you had a bluescsi on order, why not just wait for that?

Hooray :)

Check the connections to UH7 carefully. The footprint on the Reloaded board makes it difficult to solder as the pads are almost completely hidden by the chip, so poor connections are common. Check to make sure that adjacent pins aren’t bridged, too. That doesn’t seem right, the 030 chip hardly...

Isn’t @pax saying that the full 040 card they have originally came from their 550c, but that they moved it to their 520 when they upgraded the former with a PPC card?

Thanks :) Sadly, it’s game over for this PSU. One of the difficult things about working on it is that to properly swap out and test components you need to take the five boards apart, and then solder them back together again afterward. During my most recent session, I lost patience. I had...

@Cory5412 please could you edit this table with the corrected value for C253, which should be 220uF, not 22uF. It’s confusing for people as they miss the correction I made further down in post #8.

This was an error which I corrected further down in post #8. This is also why we need editable posts.

Is it a Delta SMP-220DB? My cap list is posted here.

Ah, there’s the problem then. Might be an idea to put that info on the readme file in the GitHub ROM directory, to help others in future :)

Nope, this is the standard display appearance of uninitialized NEC 41264 chips. Other brands show stripes or other patterns. I think so, they’re 5V 64K x 8bit chips, which sounds right to me.

Another thing is, it would be good to know if you’re getting any sad chimes, as would tell you if the ROM is being accessed, but without the speaker jack soldered in, audio won’t get routed to the internal speaker header. So either add that in, or solder bridge the two pads on the underside of...