Yes elimnate all, then try one.
Open Console in Utilities & see if there are any clues or repeating messages when this happens.
Ah, nuts I just remembered - when I last fsck'd on startup there was a hang over a Hub issue ; it turned some of the text pink, which was nice. It mentioned not being able to enumerate a value at one of the hubs at the address 0x4b3....; ill have to recheck that, I'm in the middle of something right now that'll take a couple of hours at least, but when that's done with I shall unplug everything to fsck the boot volume, then start plugging stuff in and fsck the bloody thing after each new addition, to see where it stumbles.
I'm interested in the idea of a USB reset though - when my MacDaddy was doing the work on it (very competent, no problem there, definitely) he was using one USB port at back to run a wireless dongle as he was setting the thing up; the g5 might still be looking for that? I use a range extender on a LAN at home, but its a courtesy to him to include the dongle for repairs as he has to get out all the old ppc installers and so forth.
Could you give me some quick instructions for a USB reset please? Preferably not as a page link though because I suffer a little screen-dyslexia after about 5 minutes. Sorry, but even a few pages would be too headache inducing.
One last bit of relevant profiler info - just checking it now and both standard USB connections are reading the following (except location):
Host controller location : built in USB
Pci device id. 0x0035
Pic revision: 0x0043
Vendor id: 0x1033
Bus number: (1 then 2) 0x0b // 0x2b
And the high speed bus is reading as 0x4b
So where're 1 and 3? If that's a thing?
Thankyou for your patience.