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Asus cs5111 small form factor "missing operating system"

I have the asus cs5111 small form factor computer, it boots sometimes but most often says "missing operating system". i really need to fix this please tell me how. THANX

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Hard drive problem either damadge or virus do a drive check at setup when you start computer (whats result) then if you boot it once when you get to main screen windows do scandisk

Posted on May 28, 2010


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My pc wont boot up, led's 3&4 flash, I have renewed the RAM and the fault is still there, does anyone have a clue what the problem is?

Allan Cairnduff,
Below is the information for the 3,4 diag error.
Memory modules are detected, but a memory failure has occurred.
  • If two or more memory modules are installed, remove the modules (see your service manual), then reinstall one module (see your service manual and restart the computer. If the computer starts normally, continue to install additional memory modules (one at a time) until you have identified a faulty module or reinstalled all modules without error.
  • If available, install working memory of the same type into your computer.
  • The memory specs for this computer are listed below.
  • Type DDR3 Synch DRAM Non-ECC Memory Memory Speed 1333MHz Memory Connectors Four (MT, DT, SFF), Two (USFF) Memory capacities Up to 4GB Minimum Memory 1GB Maximum Memory 16GB(with 1333MHz speed memory)/8GB for uSFF only Memory

    The OptiPlex 790 system supports up to 16 GB of memory in the mini-tower (MT), desktop (DT), and small form factor (SFF) chassis with 64-bit operating system. The maximum memory supported in the ultra-small form factor (USFF) is 8GB. The memory speed supported is 1333MHz DDR3 memory.
    However, 32-bit operating systems can only use maximum 4GB memory address space. Certain components within the computer require address space in the 4GB range, any address space reserved for these components cannot be used by computer memory the amount of memory available to the operating system is less than 4GB.
    Memory modules should be installed in pairs of matched memory size, speed, and technology. If the memory modules are not installed in matched pairs, the computer will continue to operate, but with a slight reduction in performance.
    The total amount of available memory will be less than 4GB. The amount less depends on the actual system configuration. To fully utilize 4GB or more of memory requires a 64-bit enabled processor and 64-bit operating system Thank You,
  • Dell-Jesse L

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1 Answer

Why my window 8.1 keep saying when"missing operating system" when i connect my toshiba external hard drive ?

sounds like you need to set up your boot drive in your start up. If you cannot find that, then it needs to be changed in the bios. you usually need to push repeatedly the delete button or the f2 key. the screen should tll you at the bottom of the screen which key to push to go to the boot drive menu or the bios menu. Be very careful in the bios setup menu, only change the boot drive.

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Will Asus GT630-2GD3 work on dell optiplex 745 core 2 duo?

Your computer uses a PCI-E X16 graphics adaptor so as long as there are enough connectors from the Power supply and it is rated high enough, it should work. If it will fit will depend on the form factor of your tower. You may need a half height card if you have a small form factor tower.

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Unknow base system device ASUS CS5111-AP007

You can download the device drivers from ASUS WEB site.Select your model motherboard/computer/laptop, and make sure you select driversthat matches your Windows operating system. Please click on this link to theirWEB support site : -

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Hp compaq dc 7600 small form factor CMDS and check sum invalid

boot into safe mode and run CMD.exe and type in CHKDSK and run that program to fix any errors. If there still is a problem. Grab the CD in your computer came with and install it. What I mean by that, is insert a disk into CD-ROM drive. Before turning off computer. Turning on computer and booting from CD to fix any errors. If that doesn't work reinstall Windows. Please rate me for assisting you today have a great day. :-)

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Problem with the HP Compaq dc7600 Small Form Factor PC Desktop Audio driver is installed but microphone is not working.

Depending on operating system installed, check for microphone enabled in "sound" setting found in control panel. Also may have a "mute" setting in sound mixer control aplet.


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The Dell GX270 small form factor has an integrated NIC card that is built into the motherboard.

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What is Mini Tower ATX Cabinet

A mini tower is a PC desktop case which is approx half the height of a full size desktop tower case. ATX probably refers to a ATX switch mode power supply.

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Foxconn ebot small form factor

press F2 or Del on boot up and see if your drive is listed, if not you may have set the jumper incorrectly on the back of the cdrom drive, if it is shared with the same cable as your hard drive then it should be set as slave, if it's on it's own cable from the motherboard then set it as master. Lastly when in the bios you need to set the cdrom drive as first boot device and when the screen pops up you press enter to boot from cd, so as to install the operating system, if you don't then the pc will look at your hardrive to boot from, finding nothing there.

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