Question about Dell Dimension 5100 (D51L1) PC Desktop

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Dell computer will not turn on.

I pulled the side panel off and pluged the computer in and a green light begins to flash on the mother board. no lights on the front light up at all. if i unplug the computer the light begins to flash slower and slower. the it stays lit for a bout three seconds and gose out. any help would be greatly appreciated!!

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Your motherboard is failing.
It is time to get a new PC.
You can try to find another motherboard to put into your case, but why would you want to do that? Unless you know for certain that the RAM, hard drive, video card etc are all good.

Posted on Jul 27, 2009

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You have to ask yourself these questions.

The boot sequence is as follows.

First check the power supply. The fans to the power supply should start to spin. If you are getting power, check the power supply to see that it meets +12.0 V, -12.0 V, +5 V, -5 V, and +/- 3.3 V.

You will need a hard drive to trip the power supply.
Next, the CPU needs to start up.
Then the RAM
The the BIOS loads and checks the main circuits.
After that, then the boot loader is searched for, usually from a hard drive.

Posted on Jul 25, 2009

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Somewhere on in the tower there should be a sheet representing what formations of lights mean which...
Maybe you got bad RAM?
Maybe your Harddrive is dead?
Maybe your motherboard is fried. I should tell you.
Good luck.

Posted on Jul 14, 2009

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Posted on Jan 02, 2017

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Power Green Light Flashing HP Desk Top PC m7250n


During a power outage their is a surge when power come back on the grid (surge can be caused by lighting strikes akso). This surge trips the internal procters inside the power supply to protect the Mother Board, hard drive, processor and fans and any device that pulls wattage from the power supply. Since all these power using devices are trying to pull power at the same time to boot the computer back up one ends up with a loop of surge thrugh the power supply with a protective trip, reset, surge again and trip again. This will continue in this loop as the computer is trying to boot all the devices at one time (Mobo, Hd, processor, cooling fans and other devices). Simoly, more power wattage is being demanded than the protectors will allow at one time causing a protective shutdown followed by a restart followe by a protective shutdown in a continious loop.
The normall sequence for a boot is to boot the board, processor and fans followed by a boot of the hard drive, and other boot devices once the board is energised, NOT all devices at the same time, as this results in an overload and trips the protectors. This protective loop is indicated by the blinking light as the power is turned on and then shut down for protection as the wattage pull is over the demand that the protectors will allow.
Blinking light indictes you are in the protective loop.
SOLUTION: 1. Disconnect the Mother Board connector, with the computer unplugged, this will allow the power supply to reset at maximum wattage upon reboot.
2. Disconnect the Hard Drive power connector and ay boot device power supply cables, this will allow the Mother Board, processors and fans to boot without an overload of the protector inside the power supply.
3. Plug in the computer and the indicator light will be solid green indicating that it is reset and out of the loop.
4. With the computer pluged in and the Power Supply fully energised, plug in the Mother Board. The computer will now boot, and the processor fan will come on and the cooling fans.
5. After computer has rebooted, shut the computer back down and connect the Hard Drive power cable and any other power cablis that were unplugged.
6. Reboot with all cables connected and you are up and running again.

POWER SUPPLIES HAVE AN INDICATOR LIGHT FOR A REASON.
REMBER - BLINKING LIGHT IS AN OVERLOAD OF THE PROTECTORS AND ELLIMINATING THE OVERLOAD SOLVES THE PROBLEM AND THAT THE POWER SUPPLY IS WORKING AND CONVERTING POWER.
NO LIGHT MEANS NO POWER OUTPUT AND THAT INDICATES THE POWER SUPPLY IS NOT FUNCTIONING AND NEEDS REPLACED.

Hope this helps everone with power outages and lightining strikes. It is a rather common problem and can also occure when building a computer and one missmatches the power supply with the board wattage needs. If the board wattage needs are greater than the power supply output you will get stuck in a potective loop eventually. WHEN BUILDING A COMPUTER ALWAYS MAKE SURE THE POWER SUPPLY CAN PRODUCE MORE WATTAGE THAN YOU CAN CONSUME AT THE MAXAMUM LOAD.
Have a great computing experiense.

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