It was a pain to un-wire things but I did, and discovered that the low-end TiVo Roamio power supply (brick) is only rated for 24 watts. And the ORIGINAL 500GB TiVo HDD is less than 2w, vs more than 8w on the upgraded HDD.
So Being as the power supply is marginally strong enough to sustain the TiVo, it is possible at start up it struggles even more, and maybe this is the cause of the internal Blue light no-start-up issue.
This suggest that maybe
the unit is fine, and I'm simply pushing it's power limit, so I think I'll keep it. I really don't want to return it because if I do I'll loose out on more than $200 of savings that I can't get any longer. (paid $400 total
, for Roamio unit w/ LTS, due to a very special circumstance with an older unit, that they won't honor any more)
I appreciate all the good suggestions! But if anyone does directly know the answers to my questions, please do still reply. -Thanks!
1) What's the INTERNAL blue light (on the motherboard) mean ?
(Current suspicion is it means "start-up prevented, due to low power
", since upgraded HDD is 6.5 watts more, and power brick has only a 24 watt total rating)