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T105 no power and steady amber LED on motherboard

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I have a PowerEdge T105 that is only lightly used but has been switched on almost continuously for 4½ years. Yesterday it suddenly powered off and won't turn back on again. There are no lights on the front or back. The only light is an amber LED on the motherboard close to the power supply unit which is continuously dimly lit (not flashing). Am I correct in thinking it's a faulty power supply unit, or could it be much worse such as a BIOS/motherboard failure? If it's the PSU, can I buy any generic PSU to replace it, or do I need to buy something specific to this range or model?

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Re: T105 no power and steady amber LED on motherboard

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Hello nfh

It sounds like the system is not getting enough power. The most likely part would be the power supply unit, but it could also be the power distribution board built into the system board. I would suggest toggling the voltage switch on the PSU to make sure it didn't move out of the 115v selection. Also, reseat the cabling and try another power cord. If the issue persists then I would look at swapping components.

This is the part number for the PSU: NH493

Some of our PSUs have extra connectors that make them proprietary. I'm not sure if this one is proprietary. I would suggest reviewing the specs and connectors to make sure they match any other PSUs you attempt.

Thanks

Daniel Mysinger
Dell EMC, Enterprise Engineer

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Re: T105 no power and steady amber LED on motherboard

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Hello nfh

It sounds like the system is not getting enough power. The most likely part would be the power supply unit, but it could also be the power distribution board built into the system board. I would suggest toggling the voltage switch on the PSU to make sure it didn't move out of the 115v selection. Also, reseat the cabling and try another power cord. If the issue persists then I would look at swapping components.

This is the part number for the PSU: NH493

Some of our PSUs have extra connectors that make them proprietary. I'm not sure if this one is proprietary. I would suggest reviewing the specs and connectors to make sure they match any other PSUs you attempt.

Thanks

Daniel Mysinger
Dell EMC, Enterprise Engineer

View solution in original post

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Re: T105 no power and steady amber LED on motherboard

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Thanks for the quick and informative response and in particular for the part number which is very useful indeed. The voltage is correctly set to 230V for the UK, and I've tried setting it to 115V and back to 230V. I've also tried an alternative power cord, but it made no difference. It sounds 90% likely that a replacement PSU will fix the problem. Is my understanding correct?

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Re: T105 no power and steady amber LED on motherboard

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Had similar issue with PowerEdge 6650,PSU replacement solved the problem.

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Re: T105 no power and steady amber LED on motherboard

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It sounds 90% likely that a replacement PSU will fix the problem. Is my understanding correct?

I'm not going to throw a percentage out there, but yes the PSU would be the first component I would replace. It would be the most likely culprit. Let us know how it goes.

Thanks

Daniel Mysinger
Dell EMC, Enterprise Engineer

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Re: T105 no power and steady amber LED on motherboard

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I finally obtained a replacement PSU (for GBP 40 when the original T105 server cost only GBP 117.50 in total) and it solves the problem. Thanks to all for the useful replies.

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RE: T105 no power and steady amber LED on motherboard

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Just over 4 years later, I am experiencing this problem again with exactly the same symptoms described above. I ordered a secondhand replacement PSU on eBay but it didn't solve the problem this time. Although the eBay advert mentioned NH493, the model number printed on the PSU is L305P-03. Unlike the NH493, it doesn't have a voltage switch, although it does support 100-240V and 50-60Hz. All the connectors are the same as the NH493.

Could the replacement PSU be incompatible with my T105? Or is it likely to need a new motherboard this time?

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