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<blockquote data-quote="CyberSimian" data-source="post: 1251670" data-attributes="member: 141969">I have traced this problem to the power supply.&nbsp; The existing one still works partly.&nbsp; There is a yellow LED on the motherboard that illuminates, and I tried the trick of unplugging the 24-pin connector and connecting the pin with the green cable to a pin with a black cable, which simulates &quot;power on&quot;.&nbsp; The fans immediately started at full speed, and blew dust everywhere. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite10" alt=":oops:" title="Oops!&nbsp; &nbsp; :oops:" loading="lazy" data-shortname=":oops:" />&nbsp; But I guess that one or more of the low-voltage lines no longer works. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown&nbsp; &nbsp; :(" loading="lazy" data-shortname=":(" />I happened to have a new power supply that I was intending to use for another project, so I have connected it temporarily, and the HTPC powers-up without problem. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />&nbsp; Unfortunately, I had removed the hard disks to copy some of the files elsewhere, and my capture disk seems to have developed the &quot;click of death&quot;. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite16" alt=":cry:" title="Crying&nbsp; &nbsp; :cry:" loading="lazy" data-shortname=":cry:" />I looked on Ebay for replacement power supplies for the Dell XPS 420.&nbsp; There were several available from Germany for a very reasonable £300 each <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek!&nbsp; &nbsp; :eek:" loading="lazy" data-shortname=":eek:" />, plus one available from France for a more reasonable £66.&nbsp; But these are pre-loved units, and the power supply is one component that I think has a limited lifetime, so I will probably buy a new unit.&nbsp; The Dell power supply is near-enough compatible with standard ATX units for a standard one to fit.-- from CyberSimian in the UK</blockquote>

[QUOTE="CyberSimian, post: 1251670, member: 141969"] I have traced this problem to the power supply. The existing one still works partly. There is a yellow LED on the motherboard that illuminates, and I tried the trick of unplugging the 24-pin connector and connecting the pin with the green cable to a pin with a black cable, which simulates "power on". The fans immediately started at full speed, and blew dust everywhere. :oops: But I guess that one or more of the low-voltage lines no longer works. :( I happened to have a new power supply that I was intending to use for another project, so I have connected it temporarily, and the HTPC powers-up without problem. :) Unfortunately, I had removed the hard disks to copy some of the files elsewhere, and my capture disk seems to have developed the "click of death". :cry: I looked on Ebay for replacement power supplies for the Dell XPS 420. There were several available from Germany for a very reasonable £300 each :eek:, plus one available from France for a more reasonable £66. But these are pre-loved units, and the power supply is one component that I think has a limited lifetime, so I will probably buy a new unit. The Dell power supply is near-enough compatible with standard ATX units for a standard one to fit. -- from CyberSimian in the UK [/QUOTE]

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