Question about Dell Dimension 8400 PC Desktop

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Will Dell optiplex P4 1.8Ghz CPU work on Dell dim8400 LGA 775 MB?

Normal 0 I have non-working Dell Dimension 8400. I am trying to figure which component/s have gone bad. I dismantle all the components, removed cpu, heat sink, cleaned applied thermal paste, got 500W new PSU. I first tried powering up just the MB no beeps, I placed CPU on MB and powered up I get beeps. 6 Long beeps G,Y,Y,Y. I tested again with 1GB stick on DIMM1. I get 2 long, 2 short, 2 long beeps back panel shows G,Y,G,Y. I took off the CPU power connector, switched on the power I get no beeps. I don't get any beeps when I take off 4-pin CPU power connector. I am wondering if its the bad CPU? I went through each capacitor to see if any bulged or leaked ones, I found none. Why would I get G,Y,G,Y which is memory error beeps if its a bad CPU? I have another Dell optiplex P4 1.8 Ghz. Just to test, I was wondering if I can try placing optiplex CPU on Dell 8400? Will P4 1.8Ghz CPU work on dell dimension 8400 LGA 775 MB? This will help me eliminate the problem. Any inputs would be a great help. I was think of getting a new board, now I am not sure if it’s a bad CPU or bad MB? What a pain.

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  • venkiler Feb 18, 2009

    It did not work.

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  • 568 Answers

Yes you can try checking the processor

Posted on Feb 14, 2009

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Dell dimension maximum cpu upgrade


This desktop has a motherboard in it that has an intel LGA 775 processor socket in it. From the spec's I found the cpu that ships with the system should be able to scale up to 3.5 Ghz. But you should be able to replace it with any Pentium 4 that fits into an LGA 775 socket.

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Dell dimension 8400 desktop shuts off by itself and power light blinks amber


Which is a direct indication of a bad Power Supply,

http://support.dell.com/support/edocs/systems/dim8400/SM/adtshoot.htm#wp1053720

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=1147665&CatId=1078


http://support.dell.com/support/edocs/systems/dim8400/SM/parts.htm#wp1058213

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

Also clean the inside of the computer out with a can, or two of compressed air for computers. You may find a soft small brush, and Q-tips will help. ('Stir' the Gunk around to 'break the crust', then the compressed air can remove it better)

Power unplugged from computer, ('Natch), and Anti-Static Precautions -> FOLLOWED.

For additional questions please post in a Comment.

Regards,
joecoolvette

Oct 25, 2012 | Computers & Internet

1 Answer

Can i use Intel Pentium Dual-Core Processor E5500 2.8GHz 800MHz 2MB in a dell dimension 4700


hello.
i have the same probleme, you can see this use link,it mabe http://www.pcbatterie.com/ can sove your probleme

Apr 12, 2012 | Intel Pentium Dual-Core Processor E5500...

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...

3 Answers

Is an intel pentium D 925 work on an asusrock 775vm800? ive went to their website and it supports 920 and 930 but i dont know if they are having issue with the 925


The ONLY thing you got to worry here is the LGA package. The rest wil fall into place and it does support your cpu specs so yes it will indeed work.

Please do be considerate and rate and leave feedback, Thanks

SL9KA
3 GHz
05A
800 MHz
15.0
4 MB (2x2)
3 GHz LGA775
65 nm
D0
0F65h
95W
63.4°C
1.225V-1.312V

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2 Answers

Dell dimension 8400 beeps 6 times monitor dosen't turn on


Below is a link to the beep and light codes for a Dimension 8400. Check your codes and reply back if you need further assistance.

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

Jun 03, 2009 | Dell Dimension 8400 PC Desktop

2 Answers

Dell Dimension 8400, no post. B and D amber.


GYGY diagnostic lights -- Memory is detected, but a memory configuration or compatibility error exists, and the 1-3-2 beep sound indicates the MEMORY test failed, which means one of the four memory has gone bad or the one of the four slots on the motherboard has gone bad, Neither the memory nor the mother board has completely gone bad, but either one slot or one memory has gone bad, try placing one memory on all slots and check which slot is the issue, then trying placing any 3 memory on the remainig slot to isolate the memory, then after that use the best 3 in the best 3 slots and check, you computer should work fine, this would help you for sure

Feb 06, 2009 | Dell Dimension 8400 PC Desktop

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