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2 Answers

My Dell optiplex 745 boots up but then reboots before the Windows screen. Can someone plz help, thank you

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  • joecoolvette
    joecoolvette Feb 13, 2012

    Take a look at this video Chris, and see if this applies to your computer, (Look CLOSE), {Starts at 0:04 },http://www.youtube.com/watch?v=KN6_-8fYH...

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2 Answers

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  • Dell Master
  • 5,660 Answers

To Add:

Primer:

The top of a Processor's case, and the bottom of the finned Heatsink, that sit on top of it, are not perfectly smooth.

Average Top view of a desktop processor,

http://www.cpu-world.com/CPUs/Pentium_4/TYPE-Desktop%20Pentium%204%20Northwood.html

Average view of a desktop computer Heatsink,

http://en.wikipedia.org/wiki/File:AMD_heatsink_and_fan.jpg

The aluminum tall finned object is the Heatsink. The bottom is flat.

A magnified view would detail out, 'Pitholes, Valleys, and Hills'.
These create an Air Pocket when mated to a flat surface, or another imperfection like them.

Air is an Insulator. Not a Conductor.

Thermal Paste is a Conductor. It conducts heat. (Simply put? Transfers it )

Thermal Paste also fills the imperfections.

A Thermal Pad, or Thermal Paste, could have been used from the factory.
A Thermal Pad is a fibrous material imbedded with Thermal Paste.
They are JUNK, and cannot be reused anyway.

If your Processor has a Thermal Pad on it, carefully peel it off, fly it out the door. (Lookout below! )

Use a stiff plastic card, such as an old credit card for example, to scrape any residual Thermal Paste, or remnants of a Thermal Pad, off.
Use Q-tips dipped in Isopropyl Alcohol, (Rubbing alcohol), to finish cleaning.

(The top of the Processor, and bottom of the Heatsink, need to be clean enough to eat off of )

It may be a gooey mess, and take Several Q-tips dipped in alcohol.
(I use 91 percent alcohol. 70 percent will do, Do Not recommend 50 percent.
That is 50 percent water also )

CAUTION!!
Isopropyl Alcohol is EXTREMELY FLAMMABLE!
Use in a Well ventilated area, with NO sparks or flames present!

[ BEFORE you work on a desktop computer, relieve your body of Static electricity.

Follow Anti-Static Precautions.
Your body carries Static electricity. Static WILL fry out (Short Circuit) the delicate hardware components inside a computer.

Computer on a table, computer Unplugged from power, computer case open;
TOUCH an unpainted surface, of the metal frame of the open computer case.

This action will relieve your body of Static.
IF, you leave your computer in the middle of working on it, be SURE to Touch the metal frame again, upon your return.

A Processor is the MOST susceptible hardware components to Static shock.

Primer over.

Computer reboots?
There are several problems that it could be, and a combination of some.

Generally it falls down to 4 things;

A) Bad harddrive. Harddrive has damage to a Sector, or sectors.
The Boot files are on a Sector.

http://computer.howstuffworks.com/hard-disk.htm

Page 8.

Perform a disk check,

http://windows.microsoft.com/en-US/windows-vista/Check-your-hard-disk-for-errors

B) Bad Power Supply.

A failing Power Supply will emulate all sorts of seemingly software problems.
(Really. I used to play tricks on IT men down at the shop. Always going after a software solution )

C) Failing capacitors on the motherboard.

With a Dell Optiplex 745 Desktop PC, the capacitors used on the motherboard are Electrolytic Capacitors.
(I have one of these babies sitting about 10 feet from me. I know)

More specifically they are Radial Aluminum Electrolytic Capacitors.

Capacitors are used as Filters, or Voltage Regulators.
The one's used as voltage regulators on the motherboard, are in the Motherboard Voltage Regulator Circuit,

http://www.hardwaresecrets.com/article/616

Part of what the motherboard voltage regulator circuit does, is to regulate voltage for the Processor.

The Processor MUST have a steady, 'clean', supply of Voltage, and it MUST be kept within a very tight tolerance range.

If not the Processor will turn off. (BIOS turns it off)

To be continued in a Comment.

Posted on Apr 26, 2012

  • joecoolvette
    joecoolvette Apr 26, 2012

    1)http://www.youtube.com/watch?v=KN6_-8fYH...

    (Starts at 0:04 )

    2)http://www.capacitorlab.com/visible-fail...

    3)http://www.hardwaresecrets.com/article/H...

    4)http://www.mouser.com/Passive-Components...

    Click on the value you want, shown in the fields.

    A) Lead Style: Straight

    B) Capacitance: This is on the side of the capacitor

    C) Tolerance: Don't worry about this. Leave this field alone

    D) Voltage: It's on the side of the capacitor

    E) Operating Temperature Range: Leave this field alone

    F) Termination Style: Radial (Both leads come out of the bottom)

    G) Dimensions: Suggest leave alone, and pick the size you want from the chart, that will be given when you click on - Apply Filters, then down on - Show Products.

    H) Product: Leave alone

    I) Packaging: Leave alone

    After you have set the values you want, it should automatically go to a product chart. If not click on - Apply Filters
    http://www.youtube.com/watch?v=YCSNWi3UH...

    Regards,
    joecoolvette

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  • Master
  • 827 Answers

Please check for the thermal grease which is applied between CPU fan and CPU to maintain the cooling of the CPU. May be the thermal grease dried. Buy the new grease and apply it.

Posted on Feb 14, 2012

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Geekman
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SOURCE: My Dell Optiplex 745 "No Boot Device Available"

No boot device means that the computer cannot find a drive that has a operating system files and therefore cannot boot up.
This usually means that the hard drive in the computer is faulty.
You need to get a new hard drive and install Windows on the hard drive, together with the drivers for the computer's installed devices and programs to get a working computer.

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SOURCE: No Boot Device Optiplex 745

Open up the PC to see if there is a hard drive in the PC. If there is, then it has just been wiped and you'll need to reinstall your OS.

Posted on Apr 17, 2009

AldRezaine
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SOURCE: problem useing 1066fsb ram in my Dell OPTIPLEX 745

Download a cpuz software from cpuz.com. It will give important details about the motherboard,memory and graphics card in your system.

Posted on Oct 30, 2009

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SOURCE: when i boot my dell

Explorer, a key part of windows, isn't automatically loaded at boot. This is a sign of severe corruption - it's time to reinstall.

Posted on Sep 17, 2010

  • 1684 Answers

SOURCE: Dell Optiplex 745 having all kinds of problems

Hello,

The main failure on the Optiplex 745 units are capacitors on the motherboard. When they fail you can get all sorts of strange problems - no boot, blue screen issues, no video or distorted video. Open your machine up and look for bulging capacitors on the board. Here is a link to a guide showing what to look for on the motherboard to determine if your problem is capacitor related or not.

http://www.ccl-la.com/blog/index.php/dell-optiplex-745-repair/

If you do find bulging capacitors on the motherboard then more than likely that will be your problem. You can replace the capacitors and your board will be as good as new.

I hope this helps, if so please rate my solution.

BuddyMc

Posted on Aug 01, 2011

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1 Answer

Hello i have a Dell Optiplex 745 it boots up and starts windows 7 normally then the the screen goes black does anyone know how to fix it?


Can you boot into Safe mode. It is usually done by pressing a specific key during the POST session. If you can, then boot into safe mode and delete the Video Driver. Reboot. TYou should have a VGA display, download and install the video driver again.

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Installing windows 7 isn't difficult. First, you need the disk to install it from. If you don't have that, Microsoft no longer sells this version, so it will be harder.
If you want to keep your programs and data, there is a package, "PC Mover" that you can buy that will help you preserve all your data and programs. I've used this many times to help upgrade systems like yours.

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My dell desktop asking for a password


If you want to create a new Basic Input/Output System (BIOS) password on a Dell Optiplex 745, reset the password. Resetting the password also applies if you want to remove an existing BIOS password. BIOS passwords are used to add an additional level of security to your machine. Without the correct BIOS password, your Dell Optiplex 745 will not complete the boot process. The password can be reset whether you know your current password or not.

Turn off your Dell Optiplex 745. Start the computer. Press "F2" the moment the Dell logo appears on the screen. You will only have two to three seconds to press the key. Enter your BIOS password. Navigate to the "Exit" screen. Select the "BIOS Password" setting. Enter your BIOS password and a new password if desired. Do not enter anything in the "New Password" box if you want to remove the BIOS password completely. Press "Enter" to save your password settings. Reset Forgotten Passwords Turn off your Dell Optiplex 745 and remove the power cord from the computer. Disconnect any external hardware and cables. Slide the release latch located on the back of your Optiplex 745. Lift the cover as you slide the latch. Hold the cover firmly and pivot it back on the hinges. Remove the cover from the hinges. Find the "PSWD" jumper on the motherboard. This is a two-pin jumper and should be clearly labeled. Use a flashlight and magnifying glass if you have trouble locating it. Remove the jumper from the motherboard. Replace the cover and slide it into place until the latch snaps into place. Reconnect the power cable and restart your computer. Shut down the computer after it has completely restarted. Disconnect all cables and remove the cover again. Replace the PSWD jumper. Replace the cover. Reconnect all cables and restart your computer.
b> Clearing forgotten passwords http://phubner.eng.ua.edu/Files/Optiplex 745/advfeat.htm - wp1117484

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1 Answer

Dell Optiplex 745 having all kinds of problems getting blue screens, but I can reboot and it works fine. I installed a new hard drive on this computer. I am not able to install the update for windows xp...


Hello,

The main failure on the Optiplex 745 units are capacitors on the motherboard. When they fail you can get all sorts of strange problems - no boot, blue screen issues, no video or distorted video. Open your machine up and look for bulging capacitors on the board. Here is a link to a guide showing what to look for on the motherboard to determine if your problem is capacitor related or not.

http://www.ccl-la.com/blog/index.php/dell-optiplex-745-repair/

If you do find bulging capacitors on the motherboard then more than likely that will be your problem. You can replace the capacitors and your board will be as good as new.

I hope this helps, if so please rate my solution.

BuddyMc

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Need to reboot my dell optiplex 330 to factory settings


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All the best!

Nov 16, 2010 | Computers & Internet

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When i boot my dell 745 optiplex windows xp icons are missing on boot up.


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My Dell Optiplex 745 "No Boot Device Available"


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