Question about HP Pavilion a305w (DM181AR) PC Desktop

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HP Desktop power up problem

My HP Desktop (Pavillion) won't power up. It got to the point where it would power up for a second or two. The blue light around the switch would show and then shut down. A few days prior it had started making loud noises. I replaced the hard drive but it does the same thing. I noticed a small fan just below the power supply seems to operate the same way. If I reset power (following the new poweer supply instructions), the fan will poweer up for a second or two, I see the blue light for a second or two and then it shuts down. Per the instructions if I turn the power supply switch off (the new power supply has a on/off switch) and disconnect then reconnect the connector to the mother board, then turn the power supply switch on it runs for a second or two. Any ideas?

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  • wgmartintx Oct 19, 2008

    Thanks a lot. I am computer illiterate but I will certainly try what I understood of the suggestions. How do I check the RAM? I replaced the old 250 watt Power Supply a 350 watt (computer store technician suggestion). Could the small fan (separate from the power supply) mounted on the front of what looks like cooling fans cause this problem. I guess what I am trying to ask is if the power supply needs an operationl feedback from that fan? Again, thank you very much for your input!!

  • plenews Dec 25, 2008

    My HP Pavilion does not power up. I went to BestBuy, they concurred that it was a bad power supply. I hooked up the new Power supply I got from CensusPC on line $50.00 with shipping. Hooked it up today, still no power. I did a continuity ck on the power switch and it seems to work fine. I shorted the 2 power button switch leads at the Mother Board with it plugged in and still no action. Does anyone know where to get a schematic of the power supply or the computer?

  • Anonymous Mar 15, 2014

    I have a HP a1700n desktop pc that will shut itself off after 5 min sometimes longer. I have cleaned the inside, tried switching ram sticks and sockets, replaced power supply, installed new 1 gig hard drive, switched power cords,removed external hardware one at a time checked for loose connections and burn spots in mother board. the only thing I havn't done is pulled the CPU,and battery. Heat sing fan runsfine I even tried putting a fan pointed to inside cabinet to make sur it wasn't overheating.
    What do you think?



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Bad ram probably, units do that all the time at my job. Most of the time, it is the power supply that does not have enough power to invest into all hardware that makes your pc. even if you had a 400watts power supply, the next time you are buying a power supply you should do some kind of upgrade. 600 watts or more. If you have a high end graphics card then you are indeed in need of a new power supply. also check your cpu, its fan, check if it still seated properly, if there still paste on top of it to hel cooling it down, and protect it from statics. if you added new hardware, remove them and keep checking if it is working. To do manual diags, you need to take the unit apart. I would start by removing rams first, and check ram one by one, then hdd, then disconnect other components until i find the actual part. I am sure it is your powersupply, worst case scenario is you mobo is gone.(but it powers up and shutdown after all so let us hope you don't have a dead motherboard." and remove the dust please, dusty units do not run properly. Neim Le Legionaire.

Posted on Oct 19, 2008

  • Neim Sims
    Neim Sims Oct 19, 2008

    check ram by using one of them at a time. if you only have one stick then time for some cheap shopping. i would say go to the closest geeksquad and have them check it out for you but I believe in trial and succes, in knowledge to experience so go to bestbuy or some pawn shop, or cheap store and get the kind of ram your unit takes. if is from the xp era, and it is a pavillion, it might be ddr but check and make sure. google the unit name and check the specs.

    well for the power supply issue, i did not quite get the question but I know there is a 4pin jack that need to connect to the motherboard and that way, it powers on the cpu and cpu fan.



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