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There are actually many things that can cause this, but the power supply is the most common. I'm actually surprised you found an SS-300SFD is stock anywhere, as they've been discontinued for some time. Note that the Netgear version is different from the standard -- it has a longer 24-pin cable and three 90° 4-pin Molex connectors. You will need a 5" (127mm) or so extender. It's pretty easy to move the 90° Molex connectors to the new supply, which also allows you to trim out some excess wires to make it easier to dress them properly in the NAS.
If you ordered on eBay from KDM Power, they are a bit sketchy in how they list the "SS-300SFD", as the fine print says "SEASONIC Replace (MIPC)". It's not a real Seasonic, but it will work. And since they also say it's a "Netgear 300w Replacement MTX35" and the 24-pin has "special wiring", I believe it has the right connectors and cable length.
There are actually many things that can cause this, but the power supply is the most common. I'm actually surprised you found an SS-300SFD is stock anywhere, as they've been discontinued for some time. Note that the Netgear version is different from the standard -- it has a longer 24-pin cable and three 90° 4-pin Molex connectors. You will need a 5" (127mm) or so extender. It's pretty easy to move the 90° Molex connectors to the new supply, which also allows you to trim out some excess wires to make it easier to dress them properly in the NAS.
If you ordered on eBay from KDM Power, they are a bit sketchy in how they list the "SS-300SFD", as the fine print says "SEASONIC Replace (MIPC)". It's not a real Seasonic, but it will work. And since they also say it's a "Netgear 300w Replacement MTX35" and the 24-pin has "special wiring", I believe it has the right connectors and cable length.
If you have a standard ATX12V supply of at least 300W, you can connect it externally and see if that fixes it. That's actually what I typically recommend before ordering the replacement, in case it's something else.
The default (programmed into the display module) display is ReadyNAS, so it only takes 5V, and not very well regulated 5V, for it to display. The motherboard doesn't even have to boot, which is why there are so many things that can cause it. But the supply is the usual suspect in an older unit like yours until eliminated.
