No Power to computer

[Thira]

I recently replaced a power supply (added a 400 watt CompUSA power supply) to an old computer. When I turned on the computer the motherboard fried (piece of metal from the case had slipped behind the motherboard.
I replaced the motherboard (Abit NF7-S- Asus PB3-F old), memory (512 MB Mushkin blue PC3200-256 PC 100 old), processor (AthlonXP 2600 Bartow- P entium III 700).
Now when I turn on the computer no power.
I discharged the CMOS.
Also to note, I had replaced the hard drive with a Maxtor 160 MB (new) and added a new DVD =/- R/RW 9 Lighton-new) when the motherboard fried.
Can anyone point me in the right direction?
Thanks

 

[endyen]

Power supplies have fuses inside. You could try to change it yourself, but most tech shops would charge more than a psu costs. They put more than one fuse in there but a massive current when a dead short is applied will generally kill components as well as fuses. Most power bars have breakers in them, make sure it isn't the power bar. Plug a light in to the power bar as a test.

 

[timberwolf1]

Hi,

Sounds like your power supply may have a problem. Did you change the power supply? It should be a problem with either the motherboard or power supply.

Gary Hendricks
<A HREF="http://www.digital-music-guide.com" target="_new">www.digital-music-guide.com</A>

 

[jlanka]

is there any evidence of power at all? Hard drives spinning up etc? If not, I would suspect something is loose (expansion card) or you still might have a grounding problem. Try the MB out of the case.

There is a way to test the power supply without the board.

To test an ATX power supply:

First, disconnect everything from the power supply (including MB.) Plug
AC cord into the rear of the PS. IF the PS has its own rocker on/off
switch, turn it ON. There should be +5v on pin 9 of the 20 pin connector
(+5vsb, usually a violet wire.) There should be >0.8v on pin 14 (PS-ON,
usually a green wire.) This is from an internal pull-up to the +5vsb.

Connect PS power leads to 1 or 2 IDE HDs (for a load). Jumper pin 14
(PS-ON) to pin 13 (ground, black wire.) At this point, fan in PS should
start spinning, drives should spin, and + 5/12v, -5/12v, +3.3v, and
+5vsb should be present at 20 pin connector.

Disconnecting pin 14-13 jumper should turn supply back off.


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jlanka (. .)
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