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Computer won't start up when using the dc-dc power supply

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  • Computer won't start up when using the dc-dc power supply

    I bought a Intel D525MW motherboard a couple weeks ago. I went from Intel d201gly2ta motherboard that was running xp on it. I had an opus Dcx3 120 powersupply and had planned on using that. I loaded the D525mw up with windows 7 and installed it in the car. This is where I ran into problems every time I would turn the ignition to start the computer it would turn on for a second. I could hear the hard drive start to spin then it would stop. Nothing ever came on the screen and I don't think it ever got to post so my first impression was that maybe the motherboard was bad. So I removed it from the car and hooked it up to an ac power supply and it turned on fine. I tried a couple times just to make sure. My next thought was maybe the opus power supply wasn't strong enough to handle the new board plus all my peripherals in the car (which consist of a secondary sound card for a mic, gps, usb hub, and obdii). I hooked the board up to a 95 watt ac power supply I had laying around and the computer worked fine. So then I decided maybe the Opus was bad. I decided to buy a M4-atx 250w. I thought for sure this would be able to handle it all. I installed everything and hooked it up and the exact same thing happened. Starts up then stops. I played with the bios jumper and can get it to start maybe once out of every five times. When I played with the jumper this is what I saw:

    If I remove it the computer will start but nothing will ever post.
    If I move it to config mode it will start but never post
    If I move it to regular mode it will now post and start up, but that won't last. The next time I start it up will do the spin the hard drive and stop.

    I don't know what to think on this. Has anyone ever seen something similar with this board? Could the board be bad? Like I said if I bring it in and put it on a ac power supply it starts fine always no problems.

    If anyone could offer some suggestions I would greatly appreciate it.

  • #2
    Have you tried connecting the mobo power switch to a normal ptm while it is in the car to imitate the PSU telling it to turn on? Just a thought

    Sent from my HTC Sensation XL with Beats Audio X315e using Tapatalk

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    • #3
      Originally posted by SarcasticStick View Post
      Have you tried connecting the mobo power switch to a normal ptm while it is in the car to imitate the PSU telling it to turn on? Just a thought

      Sent from my HTC Sensation XL with Beats Audio X315e using Tapatalk
      Yeah I tried that and the same thing happens. I also had an extra of the same motherboard and it did the same thing. Do you think it could be a bios issue. I ended up putting my old motherboard in and it started fine just runs slow.

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