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Question about Dell Optiplex 755 Desktop Desktop Computer

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Hi please help me with my Dell optiplex 755 I install Windows 10 now it's not not working the screen becomes blanks on the desktop but I see folders clear the problem is that Usb and keyboard is not working even when I try to do setup it's say Usb and hard drive not present

Posted by Sbonelo on

  • 2 more comments 
  • Larry Ng
    Larry Ng Apr 21, 2021

    Hello Sbonelo.
    NO monitor told , is it this old top?
    14 years old, Q35+core2 old.
    windows 32 bit or 64bit failing.?
    this PC is not supported by w10 at dell nor fully by Microsoft. it is too old.
    I guess you are saying the w10 installer is failing , it that the problem.
    Your post is not clear at all what what you are doing or the history of this very old PC 755 what> size?
    MT, DT, SFF, USFF

    USB ports, all fail front and rear
    we try them all for sure, not just one.

    where did you get w10 installer media
    HP does not have it, ever for this PC.
    from Torrents/ or MS w10 builder?

    surely you did not upgrade (path) vista to w10. that will not work.

    w10 32bit might install on some but will
    be weak, things fail.
    there are no w10 full drivers for this PC.

    intel drivers do not exist ether for Q35
    chip set and w10, at all.

    if lucky you can upgrade to a GT7xx video card and it may run better.
    but is expensive. and will not cure bad or
    dead USB ports.

    the last intel drivers are w7
    https://www.intel.com/content/www/us/en/...

    read it and believe it. the end. is there.

    what you did wrong first was
    not replacing that 14 year old
    RTC CMOS coin cell battery , it will not work now, and is why uSB fails.
    and why BIOS asks oddly..
    a $1 battery, sold at Walmart.
    CR2032
    this PC is the hated BTX case.
    with backwards motherboard. right side of case.
    the coin cell is , just above the 16x PCIe slot, shinny, it snaps out.
    page 5
    https://www.dell.com/downloads/global/pr...

  • Anonymous Apr 21, 2021

    w10 not supported on this PC.
    IS NOT.

  • Anonymous Apr 27, 2021

    more
    no 755 RTC coin cell ever lasted 14 years
    not one. 2007 to now. no way.
    if the monitor is that old 2007 none told
    it too will fail for CCFL lamps dead.
    or totally random dead backlamps.
    the PC is old it needs things repair
    all do that old , the battery and HDD bad.



    see this in your manual, the hidden LED?https://f5k.fandom.com/wiki/Front_Panel_...


    the LED above, are 1 clue too.
    those are DELL POST error codes.

    getting win10-64bit will fail on this PC
    32bit w10 might work. the onboard iGPU will fail for sure. intel ended support for core2, igpu ! (no w10 support)
    the cure for that is w10 certified GPU card installed , ask for one.
    8400gs gpu cards are good and w10 support
    and cheap. $15?

    I have tested many very old dells that year
    and know how to get w10 going but takes heard work and spare parts.
    we can fix them all if you can spend money.
    the 64bit CORE2 that runs is QUAD and only the newest (last)stepping CPU. works 64bit
    that year. that is geek talk but means
    the CPU must be upgraded .
    The old CPU runs 32bit but other things fail.
    like IGPU and vast GPu cards old.
    like sound
    and network chips;. fail.
    due to chip makers ending support,
    did this help say so... thanks.

  • Anonymous Apr 27, 2021

    once the RTC battery is replaced CR2032
    we test the HDD next
    after all most HDD are no good 14 years old. so we test it with the smart test
    ask how.

    after the new battery
    go to F2 BIOS pages, power on hammer F2.
    set NIC to PXE disabled.
    then set boot order to hdd first.
    the boot installer using F12 bios hot key
    F12 allows booting to any thing.
    even USB. forced.

    or run F12 DIAG first.
    power on hammer f12, and click ePSA diagnostics, it too can test the hdd.
    and many other ways too. to test.

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Jon Huang

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  • Contributor
  • 30 Answers

You can try to attach the drive with a different USB cable to another computer. That way you will rule out connectivity issues and drivers as a possible cause.

In case the issue persists, there is a good chance that something wrong with the enclosure or the HDD itself. In both cases, you can:
-RMA the drive if under warranty.

Posted on Apr 21, 2021

  • 1 more comment 
  • Larry Ng
    Larry Ng Apr 21, 2021

    his coin cell is bad.
    and w10 is not supported at all on q35 chip set core 2 DUO.

  • Larry Ng
    Larry Ng Apr 21, 2021

    in NVRAM goes dead, that means
    configs are a wreck inside.
    and that means ports go dead.
    you do know that USB ports and Sata ports on dells can be turned off or on in BIOS
    if COIN cell dies, THE BIOS GOES TOTALLY MAD, (random too)
    it is what all PCs do, dead bat.

  • Anonymous Apr 26, 2021

    it is 5minutes after trip to walmart
    and new CR2032 cell in hand.
    easy as falling off a log.
    no really.
    there are like 10,000 examples in youtube
    doing this easy act.
    it simply snaps out then in, and not put in backwards.
    then set PXE off and boot order correct.

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