Windows 10: New MB / CPU / RAM - no POST

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  1. Posts : 477
    Win10 x64 Pro -2 desktops, 1 laptop
       30 May 2018 #1

    New MB / CPU / RAM - no POST


    Yesterday I replaced the MB, CPU, and RAM of an old PC with an ASUS Prime H370-Plus, an Intel i5-8400, and a Crucial 16GB RAM Kit (8GBx2) - DDR4 2400 MT/s. No POST - no beeps, no display. Fans run, Ethernet adapter shows activity, HDD spins, etc. so the MB is getting power.

    I think I'm going to need help diagnosing this.

    Before I get a response to this plea for help I will have tried the following:
    • Reset the CPU power plugs. My PSU has a pair of 4-pin plugs; the MB has an 8-pin header. Seating both plugs is a pain.
    • Re-seating the RAM.
    • Tighten the DVI-D display cable at both ends. Maybe switch to VGA. (My monitor does not support HDMI).

    But I'm not counting on any of that working so I've got a bunch of questions.

    I had trouble reading the labels for the RAM slots on the MB but my impression was that they did not match the labels in the doc. The doc has the slots labels (from the edge of the board inwards) A2, A!, B2, B1 and show a 2-card configuration using A2 and B2. Would using A1 and B1 prevent a POST?

    I assume I can disconnect all drives and still be able to run the POST (but obviously not boot). Yes?

    I cannot be sure I've plugged the front panel connectors correctly: my fingers are fat, the labels on the MB are impossible to read, and the doc has at least one error. (It shows a 3-pin connection for the Reset button.) I know I've got the Power button and Power LED connections correct (because they work) but the doc does not match other ASUS MB configurations I've seen. Thus, I may not have the speaker connected correctly. Would a mis-connected speaker kill POST? I assume I wouldn't hear the POST beeps but POST itself would work, wouldn't it?

    I don't know what other questions to ask at the moment.
      My ComputerSystem Spec


  2. Posts : 477
    Win10 x64 Pro -2 desktops, 1 laptop
    Thread Starter
       30 May 2018 #2

    Never mind. switching and re-seating the RAM cards corrected the problem. (I don't yet know if it was mis-seated or if I have a bad card. I wanted to update this thread before continuing.)
      My ComputerSystem Spec

  3.    31 May 2018 #3

    Check MB manual as for RAM placement in single and multiple RAM stick options.
      My ComputersSystem Spec


  4. Posts : 477
    Win10 x64 Pro -2 desktops, 1 laptop
    Thread Starter
       31 May 2018 #4

    CountMike said: View Post
    Check MB manual as for RAM placement in single and multiple RAM stick options.
    It's all past history now - I've got it working.

    I read the manual. I was asking what would happen if I had not follow the manual. Would that have prevented POST from executing or would it have just caused performance problems? (Finding one typo in the manual makes me mistrust all of the manual.)
      My ComputerSystem Spec

  5. Berton's Avatar
    Posts : 5,275
    Win10 Home and Pro, Win10 Insider Preview, WinXP Home Premium, Linux Mint
       31 May 2018 #5

    Following or not following the manual is a decision the building can make but I'd wager it has a lot to do with how many builds he/she has done and maybe the number that have used the same or similar motherboard. Back in the 'good ole days' of building 80386 and 80486 plus early Pentium-class computers I had to follow the manual as there were many jumpers that had to be set to get it right. Some of those motherboards could use either AMD or Intel CPUs, jumper settings were key to not frying parts. Motherboards have evolved into being specific to a Brand and sometimes a specific line of CPUs in a Brand.
      My ComputerSystem Spec

  6.    31 May 2018 #6

    Tomorrow or day after I'm getting a "new and improved" MB. I downloaded manual and read it carefully many times before I even ordered it. Found long time ago that it gives me better idea how it works.
      My ComputersSystem Spec


  7. Posts : 477
    Win10 x64 Pro -2 desktops, 1 laptop
    Thread Starter
       31 May 2018 #7

    This was the first time I did anything more complicated than installing / removing an audio card and replacing an SSD drive. I have very little experience. I downloaded the manual and spent a lot of time comparing it with the manual for my old MB. I found an oddity so I also downloaded doc for some other ASUS boards and did some additional checking.

    I noticed that my two MBs had a quite different pin config in the front panel header. The new config also differed from othe ASUS boards. In addition, the doc for my new ASUS board showed a 3-pin connector for the Reset switch: +5v, Reset, and Ground. The Reset connector had only two wires so I was pretty sure the doc was wrong. Looking in other ASUS doc I noticed that the Reset switch connector always went to Reset and Ground pins so I assumed showing the +5v pin was a typo. But it worried me.

    In the end, the only doc problem (that I've discovered so far) was that extra +5v pin in the front panel connections. The pin config of for the front panel header on my new ASUS board really does differ from the config on older ASUS boards (which match the config of my old Gigabyte board).

    It's not nice to have a typo in the doc for a changed pin configuration. But maybe this is a realistic introduction to the world of custom builds - a world I'll probably not need to visit again.
      My ComputerSystem Spec

  8.    31 May 2018 #8

    Manufacturer's do tend to change configuration from version to version of MB. Gigabyte for instance marks version in the left bottom corner of MB while others may place sticker somewhere else. They don't update manual in some cases to reflect changes.
      My ComputersSystem Spec

  9. Berton's Avatar
    Posts : 5,275
    Win10 Home and Pro, Win10 Insider Preview, WinXP Home Premium, Linux Mint
       31 May 2018 #9

    A lot of computers of the last several years haven't had a Reset button, my ASUS from late 2016 doesn't. I have 3 Dells running that don't have it. Two of my Customs do have it but I bought the cases to fit the motherboard resources.
      My ComputerSystem Spec


  10. Posts : 477
    Win10 x64 Pro -2 desktops, 1 laptop
    Thread Starter
       01 Jun 2018 #10

    Berton said: View Post
    A lot of computers of the last several years haven't had a Reset button
    Even so, if the header has pins for the reset button then then the doc should correctly indicate which pins those are.

    In the 9 years that I've had that PC I never once pushed the reset button. I have no idea if it worked with my old board and I no idea if it works with the new board. (Not pushing the button works the same with both boards.)

    A significant difference between the old and new front panel headers: the new front panel header has "Case Intrusion" pins. The old board did not have those pins and the case has no "Case Intrusion" sensor (that I know of). Still, the old BIOS reported that case intrusion had happened. I guess it was psychic. The new BIO doesn't seem to know or care.
      My ComputerSystem Spec


 
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