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Computer will not power up.

My Dell Dimension 1100 will not turn on. I replaced the power supply but there still is no lights on the front of the computer. There is only a green light on the motherboard near where the o/f switch connects.

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Check the fuse, if thats ok then try this -

1. Remove all USB devices such as printers, mp3 players etc etc.
2. Remove the power-cable and the battery
3. Press and hold the power button for 30 seconds
4. Put the power-cable back in but not the battery and none the USB devices.
5. Turn the computer on

Posted on Jan 20, 2009

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Feb 03, 2016 | Dell Dimension 4500 PC Desktop

1 Answer

WHY DID'N START MY DELL DIMENSION 11OO ONLY BLINKID THE POWER LED


you have either one of 2 problems... your power supply is bad.. blinking orange light ??? or main board
try replacing power supply
is still blinking orange light then it is the main board

Jan 20, 2011 | Dell Dimension 1100 PC Desktop

1 Answer

Can not get computer to power back up no lights on front o rear just little light on mother board have dell 8400


Bad Power Supply, sscorbett.

Usually you have enough power to light LED lights, (Like the harddrive activity LED light for add-in cards, that you see on the motherboard), and spin fans, but Not enough power to turn the Processor on.

Dell Support >Dimension 8400 > Service Manual

http://support.dell.com/support/edocs/systems/dim8400/SM/index.htm

Technical Overview > System Board Components

http://support.dell.com/support/edocs/systems/dim8400/SM/techov.htm#wp1052739

harddrive activity light for add-in cards (SCSI LED)

The Dimension 8400 comes with an ATX style of Power Supply, that has a maximum rated Wattage of 250 Watts.
1) ALL of the LED lights combined use less than 1 Watt of power.
2) EACH fan uses 2 to 3 Watts
3) A typical Processor can use 51 to 125 Watts.

Your Power Supply just has enough power to light that LED light.
Weak voltage power rail.
Replace the Power Supply.

[ There are three power rails inside that SMPS.
Switched-Mode Power Supply.

1) The 3.3 Volt power rail
2) The 5 Volt power rail
3) The 12 Volt power rail ]

The ATX form factor for a Power Supply refers to the size, and shape of the case, for one.
Approximately 6 inches Wide, 5.5 inches Long, and 3-1/2 inches Tall.
The ATX power supply case in the Dimension 8400 however, is shorter in length.
It is 4 inches Long. (Depth)

Not an advertisement for the website, nor manufacturer.
Reference for the case size, and power cables needed,

http://www.cputopia.com/hp-400w-dell-dimension-8400.html

Scroll down to see the connectors of the various power cables needed.

You may have a Power Supply with these dimensions, and needed power cables, in an unused computer.
Perhaps someone has upgraded to a better computer, and has an unused computer that you can temporarily borrow the Power Supply for a test unit.

Make sure it has at least 250 Watts (Maximum rated wattage), plus,

1) 20-pin ATX main power cable. (Or a 20 + 4-pin ATX main power cable)

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20

[ 20 + 4-pin ATX main power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20plus4 ]

2) 4-pin ATX +12 Volt power cable

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

Plus the various power cables needed for the Harddrive, optical drive/s, and computer case fan/s, if it/they do not connect to the motherboard.

Oct 21, 2010 | Dell Dimension 8400 power supply ** FREE...

1 Answer

Dimension 1100 not booting. In Boot sequence screen, says "Hard drive not installed"


Your hard drive is probably toast and needs to be replaced and Windows reloaded.

Make sure to check your BIOS settings first and make sure the drive is showing up in there and it's not deactivated.

Sep 10, 2009 | Dell Dimension 1100 power supply ** FREE...

3 Answers

Computer will not turn on at all. Dell Dimension 5100 desktop


I would unplug the power supply from the motherboard, wait a little while and then plug it back in.
Try to power everything back up and it should come up.

I am assuming you are getting a light on the motherboard that indicates power is being supplied?

Feb 15, 2009 | Dell Dimension 5100 (D51L1) PC Desktop

3 Answers

Dell Dimension 4400 Won't Turn On


inside the pc there should be a green light. called flea light. if its not on.. then id say motherboard or power supply are bad.
take power cord off. and hold power button down for 10 ecs. then reconnect and retry. i think its abad psu.

Oct 09, 2008 | Dell Dimension 4400 Power Supply ** FREE...

2 Answers

Dell dimension 1100 will not power up.


oops..not too good..sounds like either power supply or motherboard crashed and burned

Mar 02, 2008 | Dell Inspiron 1100 Notebook

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