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Diagnostic help please

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  • Diagnostic help please

    First off, I'm almost a complete newb when it comes to computer repair. I feel like I've learned a lot from this project, but am still not confident enough buy the parts I think are bad. Anyway, here's my case.

    Two days ago, got in the car and the PC wouldn't start. No post, nothing. All I was getting was the speaker pop of what I think is it starting to turn on, then an immediate pop after that. After the second pop, I could tell the PC was off because I do get some ground noise only when the computer is off. This was a constant cycle until I turned off power to the IGN line on my M2. My first thought was that the M2 was bad, causing it to "hold" the button making the computer turn on and off like this. I brought the computer in the house to figure it out exactly, hooked it up to an AC ATX PSU, using my TV as a monitor (though it's VGA port) and a spare mouse and keyboard to fiddle around if I got it running. First time, It did POST normally. I was pretty happy. But it couldn't seem to find a bootable drive. I noticed that the Molex plug for the HDD wasn't plugged in all the way so I shorted the Mobo pins that would attach to a case switch again to turn it off. I made sure the HDD was plugged in this time and tried to start it up again. This time, both the case fan and CPU fan turn on for less than a second and stop. I get no POST or anything else. I hooked it up to speakers and get no sounds. The funny thing is that it will only do this once at a time unless I cut the power from the PSU and start fresh. Now this leads me to think the Mobo is bad. I really have no better conclusion because I'm pretty new to this. I would appreciate any input/advice that anyone may have. I would like to be as certain as possible when buy replacement parts because I am on a budget. The hardware that I'm using is in my "CarPC" specs in my profile if that helps at all.
    03 Accord Sedan CarPC

  • #2
    Before buying anything, unplug it, then disconnect or remove the BIOS battery, wait a minute or so, then reinstall, hook up the power and restart.
    My opinion is my own.

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    • #3
      Ok, gave that a try. It made the fans spin for quite some time, but that seems to be the only difference. Still no post or anything.
      03 Accord Sedan CarPC

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      • #4
        Disconnect the harddrive and anything else that might be connected (dvd, usb stuff), pull the RAM and reseat and restart. See if you get a POST.
        My opinion is my own.

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        • #5
          Still no Post. And still doesn't turn on more than once without cycling the power from the PSU.
          03 Accord Sedan CarPC

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          • #6
            My guess would be the RAM, but it could be the mobo too. Hard to troubleshoot those without a second computer that uses the same RAM or CPU.
            My opinion is my own.

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            • #7
              Well, it's got an intergrated CPU, so I couldn't switch that out if I wanted to. It's kinda funny how I've been thinking about upgrading the mobo/RAM for some time now. Right now it's the intel D201GLY with 512MB of Ram. I really like the new board with the Atom processor. So maybe I'll order that after the holidays along with a 1GB Ram stick.
              03 Accord Sedan CarPC

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              • #8
                Originally posted by blackcobra487 View Post
                Well, it's got an intergrated CPU, so I couldn't switch that out if I wanted to. It's kinda funny how I've been thinking about upgrading the mobo/RAM for some time now. Right now it's the intel D201GLY with 512MB of Ram. I really like the new board with the Atom processor. So maybe I'll order that after the holidays along with a 1GB Ram stick.
                It would probably be cheaper if you were already looking at a new board.
                My opinion is my own.

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                • #9
                  Something else sparked my mind, warranty. I've only had the board for 6 or 7 months. But I bought it as a complete Carpc from Mo-co-so, so I don't have a receipt for the board itself. Makes me think I can't go this route.

                  I've actually been pricing the new intel board with the Atom processor. NewEgg has it for $70 and 1GB RAM sticks for $10. So either way, it isn't a huge hit in the wallet.
                  03 Accord Sedan CarPC

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                  • #10
                    Ok, an update.

                    I just got the system to successfully boot! I don't know what's different, but it's running fine. Although during the Intel splash screen I hit F7 to get into the bios but it went straight to startup. Also, it seems this only works once every few tries.
                    03 Accord Sedan CarPC

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                    • #11
                      Originally posted by blackcobra487 View Post
                      Ok, an update.

                      I just got the system to successfully boot! I don't know what's different, but it's running fine. Although during the Intel splash screen I hit F7 to get into the bios but it went straight to startup. Also, it seems this only works once every few tries.
                      Sounds like RAM is bad or dirty. Maybe clean the contacts.
                      My opinion is my own.

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                      • #12
                        you apparently have a loose connection somewhere. reseat the memory, electrical connections etc. make sure while plugging in any molex connector that they are seated firmly. Once in a while, a single wire may pop loose from the connector housing and go unnoticed leaving you with the predicament you're in.

                        Tap the edge of the motherboard with a screwdriver handle while powering up the puter to see if there is any change in inconsistent start up. Hopefully that will lead you in the right direction. Report back your findings.
                        Check out my CARPC: Project Diamond Plate

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                        • #13
                          As much as I would love for it to be a loose connection, I feel it's something more. Here's why.

                          I hooked it up again and it started up first try. Was running it for a little while no problem. Was able to get it to standby and resume without an issue. But I can't get the computer to restart. It'll shut down, but won't come back up. If i short the mobo power pins, nothing happens unless I cut power from the PSU for a little while before trying again.
                          03 Accord Sedan CarPC

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