new computer power problem

Z

zrikz

[H]ard|Gawd
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Just got my new computer parts in the mail today and I started building and got everything set up, press the power button and the computer only gets power for about 5 seconds and then shuts off. I have tried disconnecting everything but the two mobo power cords and same thing, taken it out of the case and placed it on a counter with the same results. Anyone have any sugestions on what to do, ive been stuck on this for a couple hours now ;(
 
#1 what are the specs?

(make sure all you have is PSU, MoBo, CPU, RAM, V-Card)

#2 start swappin out the parts.

#3 try different ram, try the same ram in different configurations, try it 1 stick at a time.

#4 reset the Cmos/pull the battery.

#5 try a different PSU.

#6 reseat the CPU.

#7 Check power button connection, try pin jumping it.

Just a list of first steps :).
 
Using Antec true power 2.0 550 watt.
AMD Athlon 64 X2 Dual-Core Processor 4200+ Socket AM2
Asus Asus M2N-SLI DELUXE nForce 570 SLI
OCZ OCZ28001024ELDCGE-K 1GB Kit DDR2-800 PC2-6400 Gold Edition
BFG 3DFuzion GeForce 7600 GT PCI Express

#7 Check power button connection, try pin jumping it.
What is pin jumping?

Will try reseting cmos and removing the battery tomorrow morning as soon as I wake up.
Have no other psu to try at this time, my other one is only a 20 pin, need a 24, I will also try 1 stick of ram and different things with that.

I am dead right now, been trying to work on this thing the past 4-5 hours, need sleep.

Thanks in advance for the help, Im really hoping I dont have to RMA this thing.
 
Power on for five seconds then off usually means the CPU is overheating. Make sure the cooler fan is turning. If the heatsink didn't come with a thermal pad, use some thermal grease. And if the heatsink has a plastic or paper protection label, make sure you removed it.
 
did use thermal paste, will try removing the heatsink and, removing the thermal paste and remounting the hs again after I try the other things. had to remove the heatsink once before and its a big pain.
 
removed cpu and heatsink, re did thermal paste, tried with 1 stick of ram, tried so many things and the only thing I get is 5 seconds of power... on rare occasions it will go for about 7-8, just enough time for a hard drive to click on, but then it turns off again. Power supply problems cause I dont see how it could be over heating in 5 seconds.
 
Try unplugging the power switch from the motherboard and directly short the pins for a second (enough time to turn the system on) I think that was what was meant by pin jumping. You may have a sticking power switch.

Ryan
 
Also make sure your CPU fan is plugged into the right header. If it's not the BIOS may detect that there's no CPU fan running and shut down to protect the processor

Ryan
 
thats one thing that im not completly sure about... while it is plugged into the right header according to my motherboard manual, there is a CPU Fan spot, but it has 4 pins, while my cpu fan only has 3 slots, it fits fine, but what about that 4th pin?
 
It dosnt even power on the screen during that time, so no time to go to bios :(
 
I'm downloading the manual so I can go through maybe find something. I accidentally downloaded the German one at first, Asus's servers (all 4) are slow as hell right now. Anyway did you try unplugging the power switch from the motherboard and briefly shorting the power sw pin on the MB header?
 
how do you short it like you say? if I unplug the power sw pin then I cant even turn on the pc. And thank you for all of your help.
 
take something small and metal that will fit between and touch the power switch pins on the motherobard (e.g. a small screwdriver). It'll act just like you pressed the switch, after the motherboard powers up remove the shorting device. Be careful not to short to any other pins.

Ryan


PS. the 4 pin CPU fan header is supposed to be backward compatible with 3pin fans (or so says the manual) the 4th pin is for PWM controlled fans.
 
Just did the shorting thing, it did the exact same thing, power for about 5 secs then off.
 
As one person already mentioned, it may still be an overheating issue.


I just found a forum thread regarding an Intel processor (Asus board go figure) having the same problem as you're haveing. His/her problem was the heatsink wasn't properly attached. CPU do get hot quick when they don't have good contact with H/S
Make absolutely sure that your HS/Fan is mounted properly.

Ryan

PS here's the other forum thread I found the info on.
 
pretty sure that its mounted fine, ive taken it off once, wiped off all of the paste and redid it all, I put a small thing coat on the cpu then placed the hsf on, duno how I could go wrong.
 
You may also need to make sure the heatsink rentention bracket is installed correctly. Are you using the AMD supplied hs/fan, or an aftermarket one?

Ryan
 
Let's rule the PSU out (someone stop me if I'm wrong). You can plug in a 20 pin into the 24pin connector. It's keyed so that you can "unintentionally" plug it into the 4 new pins.
Take EVERYTHING off the MB except CPU-HS/FAN, one stick of RAM, and power switch

No video cards, HD, floppy, LED's CD, modems, etc

Take the 20pin PSU you said you had above and use that to power up the system. Make sure that 4pin 12v connector is pluggedi in as well. If it still powers off affter five seconds, then I'd say the new PSU is good.

Ryan
 
before I try the other psu, im going to try and flip my heatsink... if I take it off and put it back on, do I need to reapply the thermal paste, or will it be ok without a clean off / more paste?
 
I generally always clean and reapply. make sure you only about a grain of rice size amount of paste directly in the center of the CPU. You don't have to spread it out as the HS/Fan will do that when you mount it. I've always gotten better cooling by letting the HS/Fan spread the paste instead of me doing it.
 
well I just tried switching the hs, reapplied the paste and what not like you said and still the same problem. Ugh, driving me crazy, I really dont see how it could be the psu either considering it turns on for a little bit, but I have no idea whats going on.
 
looks like my some of my older psu's dont have the 12v connector to power my new puter, so Im going to try and stick the new psu into an old one and see if that works, if thats true then its between the mobo/cpu I guess. I have a psu that has the 12v but its in a working family members pc so im going to have to wait until they leave or go to bed tonight I guess.
 
any ideas on what to try and do before I go through the hassle of moving around psu's ? Edit: Posting over in the pc-media tech forum that you linked me to see if they have any suggestions also
 
I found this thread over at techimo. Says that bent CPU pins might cause this problem. Check to make sure all the pins are good and straight, and none are missing that aren't suppsoed to be

Here's the thread I found

Ryan
 
glad I have my own thermal paste =/ I will inspect my cpu shortly and report back.
 
woot.. like big time, I think I got it. I took the battery out, found in the mobo manual a pin to move to completly clear bios of settings and did that, turned it on and it stayed on for 15+ seconds until I turned it off, going to go hook it up to a monitor now and i will report back shortly hopefully!
 
1 problem solved: power stays on fine now, no more cutouts, all 4 fans spinning, cpu fan is spinning GPU fan is spinning, cd drive opens.

New problem: No video, I get nothing, monitor says check signal from cable to pc blah blah whatever, does it matter what pci express spot my gpu is in? I have it in the first one available, closest to the i/o ports.
 
Do you have to supply power to the video card, like a six pin plug on the end of the card? Try the other PCIe sot. Another suggestion is to try a regular PCI vid card if you have one available.

Ryan

PS Also make sure your clear CMOS jumper is in the correct position
 
have no pci power on my video card which was supprising to me, I will try the other pcie slot right now, will also double check the cmos pin jumper.

Also it looks like im getting no power to my usb devices, my usb mouse is not powering up at all.

This is the video card im using
BFG 3DFuzion GeForce 7600 GT PCI Express 256MB DDR3 Video Card w/Dual-DVI & HDTV-Out
 
any suggestions on what to do now? Ive tried both dvi ports, both pcie slots, tried resetting cmos again and nothing.
 
try putting your memory stick in each slot and turn it on, maybe it has to be in a certain slot.

Ryan
 
I just read a review on Newegg.com. Said that it was very picky with RAM, Have to check Asus' site for apprvoed ram list. If you have another brand of DDR2 try it out also.


Linky

Ryan
 
wouldnt I at least get some kind of bios message or video of some sort? I also cant seem to get it to power my ps2 or usb stuff. I cant turn on the num lock or scroll lock or anything, and no power to my usb mouse either.
 
If it's not detecting any memory, than there's nowhere to store BIOS POST routines while they execute. BIOS wouldn't be able to initialize anything at all if it can't run.
 
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