Question about Dell Dimension 5150 (DIM515MIN) PC Desktop

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Dell Dimension 5150 starts up on its own!!

I'm having a bunch of issues with my Dell, re. startup and shutdown.

It started with it booting up on its own from switched off. I don't have wake on LAN or wake on USB enabled - it just does it.

Then, just yesterday it started booting up on its own and immediately shutting down after a couple of seconds. Finally, it shut down and wouldn't restart. A long hard push of the on/off button would fire it up but it would shut down again after a couple of seconds. Fans kick in and HD whirrs but only briefly.

I opened the case and gave everything a clean but it didn't help. Then I went out and when I came back it had started up fully and was working fine. :$

The system is obviously shaky. Any ideas?

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  • kamsiuzo Sep 01, 2008

    pc cannot open web page

  • Him Up North Oct 03, 2008

    I changed power supply, power cable and power strip - still same problem. And then...

    I took the side off and had a root around. I disconnected the ribbon cable from the power button panel to the mobo. When switched on at mains, the PC booted right up. Of course, with the power button disabled, I can't switch it on when powered down, nor can I use the two USB ports at the front. But it has shown the nub of the problem.


  • tarek_mw Nov 26, 2008

    I have almost the same problem. I completely removed the front panel, which includes the power switch and the usb ports. I just connect the panel for less than a second. I push the button on and immediately remove it. The computer started to work. I worked for more than a month with no problems. then the same started to happen again: it works for a few minutes and just turns off. sometimes it can be booted again and sometimes not. looks like a heat thing but the fan works well. any suggestions.

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Hi All,

I had the same problem - shutting and restarting over and over again. When called Dell, they said it is most likely the motherboard and will need changing. I personally suspected that it has something to do with the power supply.

I was right. I replaced the 305W power supply with a 370W one. Problem solved with just £25 and a trip to Maplin.

Let me know if this helps.

Posted on Jan 24, 2009

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I had the same problem, tried changing the PSU but no change and the old PSU checked out fine on a power test unit.

Turned out to be the switch panel with USB and audio connectors being defective. Try changing this and you should be OK

Posted on Nov 14, 2008

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Check the power cable for some defect. It may have been twisted and the wires inside broken. Try using an alternate power cable and see how it goes.

Posted on Sep 01, 2008

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Posted on Jan 02, 2017

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I hope this helps and good luck! If my answer was helpful, please rate it "4 thumbs up" Thanks!

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