Question about Dell Dimension 5150 (DIM515MIN) PC Desktop

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Dell 5150 won't power up

The computer was on for at least one year and i never turned it off,until this past weekend ,when i was going out of town for three days i decided to give it a, when i came back and wanted to turn it on, ,nothing.the green light on the mother board is on and when i push the power button,i see a very tiny light which is very hard to notice blinks every 2 seconds for 3 or 4 times ,but nothing happens.i disconnected all the wires from the back and pushed the power button for at least 25 seconds to take the static out ,but again ,no luck.that was all could do, so, if anybody knows how to fix this,please let me know.thanks.

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  • mike arzan Nov 06, 2008

    Thank you all for help.i tried both solutions ,but unfortunately no change.when i disconnect and then reconnect the ac wire and then push the power button ,as long as the button is pushed i can see a flashing light every 2 seconds,but when i release the button ,there is absolutely no light on the  power button and is completely blank.

  • mike arzan Nov 06, 2008

    Hello again
    today i went thru the whole process again,disconnected everything from the back of the computer and inside as joe asked me to do it and then pushed the power button for about 15 seconds as it was in rachelgeek23's solution and then put the ac wire back and boom,computer turned on,but when i tried it again ,same problem,then again pushed the power button for 15 seconds and put the ac wire back ,turned on,i realized i had to do this everytime that i want to turn the computer on.
    now i can turn the computer on with the above mentioned process,but the question is what if i turn it back off again ,i know i will get in trouble again until i do the process again and i want to know is this ok.or just go ahead and leave the computer on forever in order to eliminate this annoying process.

  • Dave Kneppel Nov 07, 2008

    I have the same problem as kobra51 except when I tried his method it didn't work. The orange light would flicker every few seconds when I hold down the power button and the green light on the motherboard would be on, but nothing happened. Please help!

  • 285plant Nov 29, 2008

    I shut down 5150 and all peripherals so i could disconnect the power at the breaker as i was changing an overhead light. When I powered everything up again the PC wouldn't boot, just a blinking light coming from the start switch. i shut down the PC every day and this the first time this has happened. i tried all the the basics and no luck.

  • YBARRA1SHOP Feb 12, 2009

    same issues invovling power enable as system is booting up @ startup.

  • Andreas Gieryic Feb 19, 2009

    Exactly the same issue as mentioned. I had bent prongs within one of the front USB ports. After straightening the prongs, the PC came back to life. This was a tough troubleshooting experiece trying to narrow down the motherboard or power supply. Good Call!

  • Gemmo Pc Repairs Jan 19, 2014

    I just fixed similar problem none booting on my Dell dimension 5150 .Amber light was keep flashing on I/O plate. I though first it was faulty mob but all caps was looks fine. first I remove I/O plate ribbon from mob and try that way but didn't help so Just give a try to change PSU and that was it start boot again. I guess some caps fail on PSU . Hope this helps to other people with similar problem.



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This is a walkthrough from dell's website which gives you instructions on how to solve your issue.

Posted on Nov 05, 2008

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I was having a look at a friend in works PC. Again a Dell Dimension 5150.. It also has a boot up problem (does nothing but orange light flashes) After already taking it apart and making sure the hardware wasn't broken I had a search and came across this! I'm glad I did because one of the front USB ports was damaged! and i'm pretty sure that would have been one of the last things i would have looked for!

Thanks for all the posts!


Posted on Nov 24, 2008

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To my surprise, I looked on the back of the computer and sure enough one of the USB ports was bent out of shape causing the short. I fiddled with it and as I moved it, the mother board came to life! The fan twitched and the hard drive made a noise (or what I think was the hard drive). I pressed the power button and it turned on! Good fix David.

Posted on Nov 14, 2008

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Hi I had the same problem but I traced it to a bent pin in one of the USB sockets
the pin was shorting against the earth plate, hope this helps.

Posted on Nov 11, 2008

  • david763 Nov 11, 2008

    Hi, if you have to remove the cmos battery every time, then I would say that your bios has a problem, see if you can get an update for it and flash it, this is common.


Hi dave the only thing that i forgot to mention is ,there is a very small tiny battery on the M/B which i took it off and i was suspicious that it is not working right ,so after i took it out ,i adjusted the negative terminal of it which looks like a very small fork and then put back in place and then discharged the power button for about 15 seconds and reconnected the ac wire without doing anything else until the computer turned on by itself. just remember ,i had to do the exact precedure every time that i was going to turn the computer on including to take the small battery off and put it back kinda weird isnot?.worked for me,i hope it'll work for you too.good luck.

Posted on Nov 07, 2008

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Take the Ac cord off the back of the PC, then take out the boards you have in the PCI slots. Then I would re-seat the memory. Turn the PC back on after re-seating the memory, but before putting the boards back in. See it it powers up.
If it does,put the boards in one by one. Then try to power up.

Word of advice, Windows needs to be restarted at least once a week so that it could recover its resources.
If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
Thanks, Joe

Posted on Nov 05, 2008

  • JDTec
    JDTec Nov 06, 2008

    Last thing is to check the voltages on the power supply unit.

  • JDTec
    JDTec Nov 06, 2008

    If this continues, It may be a intermittant power supply. A capacitor may not be charging/discharging correctly.


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1 Answer

My Dell Dimension 5150 won't turn on. it makes a long beep, pause, and 3 long beeps, then pause, then 2 long beeps. what's wrong with it?

the beeps are post during post the very first work is done by the ram,all the memory in the ram is first transferred to the hard disk,and remains active untill turned off.

make sure that your RAM and Cmos battery are securely seated

Test all leads that attach to your hard drive including electrical extensions IDE SATA

the leads from your ((motherboard to your hard drive)) make sure they have a secure connection and are not faulty or just replace them they could be faulty

graphics card is seated properly with no dust in the socket you might have to remove it to check for dust

a computer needs power and data to travel through every working device and to its continue its cycle and to have and end to function

make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure make sure the connections and are not faulty even the electrical extensions or just replace them they could be faulty
a computer needs all electric current and computer data to travel to and through every working device and have an end to work properly click start right click on my computer so any faulty leads will end up with a computer error

hope this helps you

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Dell dimension 5150 wont boot past post. I've tried afew things but nothing works. can you help? thanks

If it won't go past POST then there is a hardware error. Try removing the hard drive and RAM. The mother board should complain at power on giving messages. If it does, try fitting the RAM module by module, then the hard drive.

Apr 17, 2011 | Dell Dimension 5150 (DIM515MIN) PC Desktop

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Should my fan run all the time on desktop dimension

Yes, the computer case fan, and the Power Supply fan should run constantly.

If this is in reference to a Dimension 5150, there is one computer case fan in the front. This fan pushes air through a plastic tuned port, (Shroud), onto the Heatsink, which sits on top of the Processor.

The above link is to Dell Support, and the Service Manual for the Dimension 5150.
Technical Overview shows the inside of the computer.

Processor's have a thermal limit. Once they exceed this thermal limit, or temperature, the Processor turns off. (BIOS turns it off)
This is a Fail safe feature built-in to keep the Processor from burning up.

Desktop computer fans run all the time, unlike laptops.
However the fans should not run at full speed all the time.

If your desktop computer fan sounds like a 'jet engine' constantly, there may be internal hardware problems, for one.

1) It may be that the thermal paste has dried up.

The top of a Processor's case, and the bottom of a Heatsink are not perfectly smooth.
There are 'Pits, Hills, and Valleys'.

The above mentioned imperfections cause a void. This void is an air pocket.
Air is an Insulator, not a Conductor.

Thermal paste fills these voids, and is an excellent conductor of heat. Transfers the heat from the top of the Processor's case, to the bottom of the Heatsink.

Example of a typical Heatsink/Fan combo,

The Heatsink is the finned aluminum looking object under the fan.
(The Dimension 5150 does not use this kind of Heatsink/Fan setup. I included the link to show a typical Heatsink. The front computer case fan, pushes air through a plastic shroud which encases the Heatsink, in a Dimension 5150)

Solution is to Thoroughly clean the top of the Processor's case, and the bottom of the Heatsink, and correctly apply fresh, new thermal paste. (Average cost of thermal paste for this application is $6)

Observe Anti-Static Precautions!]

2) If the inside of the computer is dirty, as well as the inside of the Power Supply, this will also cause the cooling fan/s to race at high speed.

Solution is to use a can, or two of compressed air for computers, and clean the inside of the computer, (Especially the fins on the Heatsink), and the inside of the Power Supply.

[Again, observe Anti-Static Precautions]

Sep 12, 2010 | Dell Dimension 5150 (DIM515MIN) PC Desktop

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Most times when you have flashing yellow light there is issue ether with cpu or motherboard. Just to be safe test the power supply and if ok then try to replace cpu and go from there. If power supply issue just replace it. Might be easier to take it to pc repair store. Good Luck

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Oct 29, 2008 | Dell Dimension 5150 (DIM515MIN) PC Desktop

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