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2 Intern
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175 Posts
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June 28th, 2025 11:47
XPS 8920, won't power on
Mine won't power on either. Just had it unplugged for a week. Reset/replaced battery.
I'd never used that button on the P/S before but the green light comes on, fan full blast, and lights on an add-in card come on. Odd thing is, normally when plugging in the power cord, the green light will come on for a moment and the fans spool up at normal speed, then it will shut down. I no longer goes through that sequence.
Is this P/S somewhat common? I had a much older Dell years ago I was able to repair with a Corsair I got from Fry's. I forget the spec I searched for but it was an easy fit.
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redxps630
9 Legend
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14.4K Posts
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June 28th, 2025 16:13
try clear cmos settings by motherboad jumper. fan full blast means cmos settings are corrupted.
rh310
2 Intern
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175 Posts
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June 28th, 2025 16:32
I tried that after replacing the battery. The fan full blast (I think) is expected behavior when holding in that BIST button.
rh310
2 Intern
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175 Posts
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July 1st, 2025 03:52
Guess it was a bad P/S - despite the BIST button lighting everything up and spinning all the fans. I ordered a replacement then discovered an XPS-8900 I'd just retired had a very similar P/S. Same specs, just variations on cable lengths. So I bought a 4-pin extension for the CPU P/S connector - which is BURIED beneath the CPU cooler. Future P/S replacements will be much quicker - hence it will likely never fail.
Still skeptical though. I'm gonna move the "bad" P/S to the XPS-8900 to be CERTAIN it's bad. Just in case leaving it completely disconnected for a few days cleared up any electrical cob webs that was keeping it from working.
Then I'll install the replacement I bought in the 8920 since it's supposed to have the special connector for the DVD - just in case some day it might be needed for something.
Lastly, I was thinking that all my Dell's briefly powered on when re-connected to power. But even with the working power supply this 8920 does not. So maybe I was wrong in thinking that was a requirement as a signature of a properly working unit.