Parity and disk3 dropped offline almost immediatly after array start:
Jan 14 00:44:27 TowerPAPA kernel: ata4: link is slow to respond, please be patient (ready=0)
Jan 14 00:44:32 TowerPAPA kernel: ata4: device not ready (errno=-16), forcing hardreset
Jan 14 00:44:37 TowerPAPA kernel: ata4: link is slow to respond, please be patient (ready=0)
Jan 14 00:44:42 TowerPAPA kernel: ata4: SRST failed (errno=-16)
Jan 14 00:44:47 TowerPAPA kernel: ata4: link is slow to respond, please be patient (ready=0)
Jan 14 00:44:52 TowerPAPA kernel: ata4: SRST failed (errno=-16)
Jan 14 00:44:57 TowerPAPA kernel: ata4: link is slow to respond, please be patient (ready=0)
Jan 14 00:45:27 TowerPAPA kernel: ata4: SRST failed (errno=-16)
### [PREVIOUS LINE REPEATED 1 TIMES] ###
Jan 14 00:45:32 TowerPAPA kernel: ata4: reset failed, giving up
Jan 14 00:45:32 TowerPAPA kernel: ata4.00: disabled
Jan 14 00:45:32 TowerPAPA kernel: ata4.01: disabled
And a few minutes later disk1 and disk2 did the same:
Jan 14 00:53:51 TowerPAPA kernel: ata3: link is slow to respond, please be patient (ready=0)
Jan 14 00:53:56 TowerPAPA kernel: ata3: device not ready (errno=-16), forcing hardreset
Jan 14 00:54:01 TowerPAPA kernel: ata3: link is slow to respond, please be patient (ready=0)
Jan 14 00:54:06 TowerPAPA kernel: ata3: SRST failed (errno=-16)
Jan 14 00:54:11 TowerPAPA kernel: ata3: link is slow to respond, please be patient (ready=0)
Jan 14 00:54:16 TowerPAPA kernel: ata3: SRST failed (errno=-16)
Jan 14 00:54:21 TowerPAPA kernel: ata3: link is slow to respond, please be patient (ready=0)
Jan 14 00:54:51 TowerPAPA kernel: ata3: SRST failed (errno=-16)
### [PREVIOUS LINE REPEATED 1 TIMES] ###
Jan 14 00:54:56 TowerPAPA kernel: ata3: reset failed, giving up
Jan 14 00:54:56 TowerPAPA kernel: ata3.00: disabled
Jan 14 00:54:56 TowerPAPA kernel: ata3.01: disabled
Rebooting should bring them back online, but there's likely a power/board issue, also controller is set to IDE but I believe that board doesn't support AHCI, if it does change it.