SamC,
fordem makes a good point. In most all cases, an LED (and it's reporting circuit) simply monitors and reports. So, the good news is... If the LED fries (goes 'open') or, if the circuit really does go bad, it won't otherwise interfere with actual operation of the unit.
However, let's take it another step, or two, or three... Since it may not be 'broken' at all; it may be due to one of several other simple possibilities... Maybe a logic switch (within a chip) got 'hung'. Or, maybe a 'weak' plug/jack connection is causing high resistance (due to repeated heat expansion/contraction, oxidation, etc.). Or, whatever. So, here are a few questions that may provide some insight:
- Do you ever Pwr Off/On the unit?
- Have you ever found it shut down on it's own?
- Do you have the unit plugged into a real Surge Protector or, even better, a UPS?
- Also, what about your Switch, Router, Cbl Modem, or anything else that can let a spike get through a direct (or indirect) path?
Also, since you didn't mention any troubleshooting, I'd suggest:
First test...
- Do an orderly shutdown (of the DNS-323)
- Unplug the Pwr Cbl
- Wait 60 Sec
- Plug in the Pwr Cbl
- Turn it on
- See what happens
Second test (If no change in symptom, or the next time it happens)...
- Do an orderly shutdown (of the DNS-323)
- Unplug the Pwr Cbl
- Wait 60 Sec
- Re-seat the drives -- WARNING: Take care to comply w/ ESD precautions!
- Plug in the Pwr Cbl
- Turn it on
- See what happens
Third test (If no change in symptom, or the next time it happens)...
- Do an orderly shutdown (of the DNS-323)
- Unplug the Pwr Cbl
- Wait 60 Sec
- Swap the drives around -- WARNING: Take care to comply w/ ESD precautions! Also, as far as I know, swapping the drives around (in your current configuration) won't affect your data; but, since I've never tried it... you should get an expert opinion before you actually try this one.
- Plug in the Pwr Cbl
- Turn it on
- See what happens