Hey, good news
At least this time the delay is not due to a SpaceX problem.
The 17th SpaceX resupply mission to the International Space Station has been delayed to no earlier than 3 May as ground controllers work on a plan to deal with a power problem onboard the orbiting lab. On 29 April NASA noted a problem with one of the ISS's Main Bus Switching Units (MBSU), which routes electrical power from the …
They're planning to buy more. That said, this launch was a cargo-only ship, so being delayed a few days has no affect on the crew-transfer side of things.
Of course, what with the minor 'anomaly' SpaceX had last week, the crew transport program has it's own, separate, problems.
As mentioned previously, the headline definitely makes it seem like "another" SpaceX failure.
The headline would have been more accurate if it had been: Dragon Docker Down: No SpaceX Today
The Register really seems to have it in for SpaceX. The headlines and stories are rarely complimentary.
They have power to the arm, they just don't have backup power to the arm. Not a big deal if power fails during a part swap (unlikely, but if it does happen they can send out a person as you suggest). A bigger deal if it fails while capturing a Dragon (equally as unlikely, but now there's an untethered Dragon).