View Full Version : No Power?
empty
12 Sep 2003, 10:24 PM
Ok i got a new comp today hooked it all up plugged in the power supply and nuthing happens, any suggestions welcome.
leishi85
12 Sep 2003, 10:30 PM
did u plug the power button to the motherboard, and to the right pins, and also try clear CMOS.
empty
12 Sep 2003, 10:34 PM
yea i did plug it in to the right ones ill try to clear cmos
empty
12 Sep 2003, 10:40 PM
clearing cmos didnt work
:(
This may be fairly obvious, but did you make sure the PS is switched on?
and what Mobo are you using?
empty
12 Sep 2003, 10:55 PM
yes the ps is switched on and it is the abit nf7-s 2.0, and when i switch the ps onn the fan does start spinnning for a second but i am getting no power to the motherboard
GHoosdum
12 Sep 2003, 11:04 PM
Did you plug the second power connector, the 12V, into the motherboard as well?
empty said
yes the ps is switched on and it is the abit nf7-s 2.0, and when i switch the ps onn the fan does start spinnning for a second but i am getting no power to the motherboard
That almost makes me think the board is shutting down due to the cpu overheating. Does that board have "auto cpu shut down" ?
empty
12 Sep 2003, 11:12 PM
ok the abit fan is spinning on the mobo when i turn it on but still no power... keep suggestions rolling
empty
12 Sep 2003, 11:13 PM
BDR said
empty said
yes the ps is switched on and it is the abit nf7-s 2.0, and when i switch the ps onn the fan does start spinnning for a second but i am getting no power to the motherboard
That almost makes me think the board is shutting down due to the cpu overheating. Does that board have "auto cpu shut down" ?
i havent een got it turned on so i dont think that is it
GHoosdum
12 Sep 2003, 11:14 PM
How long does the fan spin?
Oh, and the 12V connector is the one that is "above" the main motherboard power connector, if you think of the AGP slot as "below"
You have video card and other components well seated?
I mentioned the cpu because on my first build, I didn't have the cpu locked in all the way and it kept shutting right back off. The cpu overheat protection was on by default. (good thing too)
empty
12 Sep 2003, 11:18 PM
just about 2 secs before i turn it on though
empty
12 Sep 2003, 11:19 PM
and the video card is seated properly ill check cpu, i know the vid card works for sure because ive used it on my comp
GHoosdum
12 Sep 2003, 11:21 PM
What is the rating on your PSU, and do you know what model it is?
empty
12 Sep 2003, 11:33 PM
it is a premier 350w it came with the case
GnomeWizardd
12 Sep 2003, 11:36 PM
had the same problem
to clear cmos then shut power off completely and unplug from the board. Plug power back in and fire it up.
GHoosdum
12 Sep 2003, 11:37 PM
Hmm... the PSU might not be providing enough power to run everything. 350W is kind of weak for the higher clocked Athlons. What does it say on the PSU for how many watts each voltage puts out for 12V and 5V especially...
empty
12 Sep 2003, 11:40 PM
180 and 150
Enverex
12 Sep 2003, 11:42 PM
Did you use the standoffs on the bottom of the Motherboard? You know the things that go between the mobo and the case to stop it from shorting out. It will only turn on for a sec before immediately turning itself off again if it is shorting out......
NS
empty
12 Sep 2003, 11:43 PM
yes i did, the motherboard isnt even turning on though just the fan moves when i turn on the psu
Straight_Man
12 Sep 2003, 11:49 PM
Ok, the following SHOULD happen-- FANS go on and stay on, including one in PSU. IF PSU fan never goes on then PSU is dead or you have a ground short in case or motherboard mounting or somehting shorting it, a DEAD on ARRIVAL CMOS cell, CMOS cell that was shipped in reset mode and needs to be flushed as it was grounded duirng mounting while enabled, or RAM that is not at all good in first module of first in line DIMM.
With NO video card in you should get beeps and fan shuold stay on-- if you plugged in the case speaker and reset and power-good circuits onto motherboard.
Reversing USB connections can ground short such that you get a no-boot and no-beep also, unplug USB wires and audio and LED connectors. Go to raw basics. If you get a system BIOS panic of continuous tones or alternating high-low tones and box stays on for over 30 seconds you have a basic good power circuit unless PSU is damaged and not dead. I have seen about 3% of the time a reship of an RMA'd and damaged PSU in a different case by many folks.
Ground shorting CMOS cell for 10-15 minutes will drain it beyond use at first poweron and not using studs of right height will cause ground shorts if they are too short--anything under motherboard that conducts can cause a ground short unless it is a correctly positioned vertical to mohterboard plane stud when the case is motherboard mount plane DOWN. I tried to give you order I would check things myself as a triage tree in text form.
John.
AuthorityAction
12 Sep 2003, 11:50 PM
I've had the same problem. My board was shorting out, try taking out the motherboard and set it on the mobo box or something non-conductive, then hook the cpu, psu, memory, and video card and see if it works.
I can list a few things I have run into that caused mine not to power up.
1) the cpu thing I already posted
2) connected front panel wiring wrong ( the manual was wrong and I had to go to the website and get the correct diagram)
3) not clearing the CMOS after connecting wiring wrong
or maybe bad ram stick?
GHoosdum
12 Sep 2003, 11:54 PM
An amigo of mine had a similar problem... RMA'd the mobo and the next one had the same problem. Sent it back for refund and bought an Asus... problem solved!
empty
12 Sep 2003, 11:55 PM
well this is my parents comp so if it doesnt work they will go buy a dell ewwwwww
You have it hooked up to at least one drive, right?
cdrom, floppy, etc?
profdlp
13 Sep 2003, 12:56 AM
...then I think you have a CPU fan not spinning detection glitch. I had this same exact problem with one of my old T-Bird boards. The bios had no delay to allow the CPU fan time to spin up. As soon as the power was turned on the board would immediately sense that the CPU fan wasn't spinning fast enough and turn everything right back off.
I finally got around it by repeatedly pressing the power button - eventually it would start and stay started. (This is risky, I wouldn't necessarily recommend doing it that way).Then I found an updated bios with a delay built into the fan speed detection. The bios would wait a few seconds when fan speed dropped too low before nixing the whole works.
If it is a hardware problem you'll basically have to try swapping out components until you find the stinker. I'd start by trying a new power supply.
Good Luck - you've got to save your P's from a Dell!:banghead:
Geeky1
13 Sep 2003, 02:34 AM
Is the red LED on the motherboard lighting up? If not, it's almost definitely a PS problem.
empty
14 Sep 2003, 04:23 AM
i still dont know what was wrong with it but who cares i got it working :)!
empty said
i still dont know what was wrong with it but who cares i got it working :)!
:thumbsup:
What did you do to get it working? Maybe the info will help someone else in the future. :buck:
empty
14 Sep 2003, 08:08 PM
i took everything out put it on the box and it worked, put it backed in the case and it still worked.
Enverex
14 Sep 2003, 08:12 PM
Yep, sounds like it was shorting out somehow, that or something was not seated properly, oh well, at least it was just a menial thing and nothing was dead or damaged.
NS
Leonardo
14 Sep 2003, 10:25 PM
i took everything out put it on the box and it worked, put it backed in the case and it still worked
Guaranteed to kill gremlins 50% of the time, if used in conjunction with a CMOS jumper reset!
(OK, if Leo is so smart, why didn't he say this before I went through all this trouble? :eek: )
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