Question about Dell Computers & Internet
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,
Average view of a desktop computer Heatsink,
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 )
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.
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.
Perform a disk check,
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,
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
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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Posted on Jan 02, 2017
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.
Posted on Sep 07, 2009
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
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.
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.
Posted on Aug 01, 2011
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