General discussion

Locked

No Power

By lora3498 ·
I cannot get my computer to turn on or show any sign of getting power. I have replaced the power supply, changed motherboards, changed the battery on the motherboard, check connections and the power switch. I have taken the power supply to a computer store and had them test the power supply so I know it is okay. I have checked the wiring to the switches to be sure they are on correctly. I'm lost after this. I don't even get any lights or any sounds from the power supply that it is starting up.

This conversation is currently closed to new comments.

17 total posts (Page 1 of 2)   01 | 02   Next
| Thread display: Collapse - | Expand +

All Comments

Collapse -

by CG IT In reply to No Power

ummm first off what KIND of power supply AT or ATX or?? and second if it's ATX have you double checked to make sure the power on switch cable on the case is connected to the right pins on the motherboard. If you don't connect the power on/off switch on the case to the correct pins on the mainboard, you can't turn the thing on.

Collapse -

by CG IT In reply to

note: since you said you checked "everything" and it appears that you have checked everything that would prevent you computer from turning on, it could be your processor is bad. The computer also wont' turn on if you processor is bad.

Collapse -

by CG IT In reply to

you betcha !!! the power switch on the front of the computer case has a cable that has to be connected to the correct pins on the motherboard so when you push the button, the computer starts.

Collapse -

by lora3498 In reply to

Poster rated this answer.
None of these comments helped but thanks.

Collapse -

by lora3498 In reply to No Power

It's an ATX case. The wiring harness that comes out of the power supply only attaches to the motherboard (plastic clip) only one way. Is there something else I should be looking for?

Collapse -

by lora3498 In reply to No Power

I did check the switch pins and made sure they were correct. I tried them both ways just to be sure. But the processor, how do I determine if it is bad?

Collapse -

by lora3498 In reply to No Power

Point value changed by question poster.

Collapse -

by csmith In reply to No Power

The switches in cheap ATX cases fail fairly regularly.
We replace about 4 per year.
Check the switch by taking a small screwdriver (Called a tweaker.) and touch it between the two pins that connect to the switch on the front of the case.
What this does, is simulate you pushing the button on the front of the PC, to turn it on. (When you push the button it connects the two wires together temporarily.)
If the PC turns on, the switch is bad.
If not, the motherboard is cracked.
The sinal goes from the wires, through the motherboard, to the power plug , to the power supply.
If the connection in the motherboard is bad, there are usually other problems with the board, also.
Regards, Chris

Collapse -

by gkheart1 In reply to No Power

Hi,

I can't help but wonder if this is a new machine you just assembled. Or was it at one time a running machine? If the machine has a P4 chip it may also have a 4 pin connector on the mainboard for processor power and the power supply must also have a 4 pin connector as well
if the mainboard has the 4 pin connector it must
be connected to the power supply for processor power. The 4 pin connector I am refering to is square, the same color as the main power connector and located near the center of the mainboard on the intel boards. Not knowing the specs on the machine makes it difficult to help. I hope this is of some help to you, And maybe post some specs ok.
Regards, Gil

Collapse -

by scott93727 In reply to No Power

If you have no beep codes, you probally have a bad cpu, if it beeps, make sure menory and options cards are fully seated.
Sccott

Back to Desktop Forum
17 total posts (Page 1 of 2)   01 | 02   Next

Related Discussions

Related Forums