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Actually, the cables on a standard ATX supply are typically long enough to reach where they need to to use it externally. What you may need is SATA to 4-pin MOLEX (old hard drive) connector(s), since the NAS uses three. If you are going to do anything more than just verify the power supply is the problem, then make sure you seal up the gap where the cables come through with masking tape or similar so the air flows properly and the drives stay cool.
You will need an extender for the 24-pin ATX connector if you are replacing internally with a standard SFX format supply, and may still need the MOLEX adapters. The most recent supply I've used is a APEVIA SFX-AP400W, but those also seem to be discontinued now. It seems that anything under 500W is becoming hard to find. Of course, a 500W or bigger will work, they'll just cost more.
So I wonder, is it possible to replace the PSU with a cheap standard PC one?
If you replace the NAS with a current 6-bay ReadyNAS (or 8 bay), then you can migrate the disks to the new NAS. If the array is undamaged, then it will mount the array as read-only so you can offload the data.
However, you can also replace the PSU. There's one on ebay at the moment for ~$65. There likely are other models that will fit - @Sandshark might have some suggestions.
You can temporarily use a standard PC supply externally, if you have suitable extension cables.
Can you confirm that you have an Ultra 6 (and not an Ultra 6 Plus)?
Actually, the cables on a standard ATX supply are typically long enough to reach where they need to to use it externally. What you may need is SATA to 4-pin MOLEX (old hard drive) connector(s), since the NAS uses three. If you are going to do anything more than just verify the power supply is the problem, then make sure you seal up the gap where the cables come through with masking tape or similar so the air flows properly and the drives stay cool.
You will need an extender for the 24-pin ATX connector if you are replacing internally with a standard SFX format supply, and may still need the MOLEX adapters. The most recent supply I've used is a APEVIA SFX-AP400W, but those also seem to be discontinued now. It seems that anything under 500W is becoming hard to find. Of course, a 500W or bigger will work, they'll just cost more.
