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Esprimo P520 E85+, boot failure, after battery replacement and FUJITSU D12-250P1A power supply, how to test?


New Member
Aug 2, 2021
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I got recently an Fujitsu Esprimo P520 E85+ Desktop that won't start.
After replacing the battery on the motherboard, BIOS won't load.

I want to test firstly the FUJITSU D12-250P1A power supply.
I removed it from the desktop. Can anyone tell me, please, how could I start it?
I got 12V on the green wire and 11,7 on the brown/yellow one.
Wil it start with no load?

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Nov 11, 2004
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Short these pins.



New Member
Aug 2, 2021
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Thank you very much for your answer, LostSwede!
Unfortunately the power supply connector doesn't match your description, it is about a proprietary Fujitsu 16 pin connector. See att. please. I have 12V on pin 7 and 11.7 on pin 8. No idea what pin should I short in order to start it...


  • Fujistsu Power Connector.jpg
    Fujistsu Power Connector.jpg
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Oct 8, 2015
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The grey one ,PG (power good) to ground to start it manually.


New Member
Aug 2, 2021
3 (0.06/day)
Hi, "dont-whant-to-set-it"!
Thank you very much for your answer! Unfortunately, grounding the grey pin didn't work. Finally I was lucky: I replaced the battery on the motherboard and the power supply started with full load. Another problem: bios won't load...
However, thank you again, all, for your effort trying to help me!