Computer won't post

Going to Cali · 15 Jun 2007 at 12:52

Computer won't post - IT's the PSU but I'm VERY confused!?

Hi,

My little bro and Dad are trying to build a PC and they're getting stuck. Their components are

Asrock 4CoreDual-VSTA
Conroe 2160
2gb geil ram
Akasa Ultra Quiet 400W Paxpower Active PFC ATX2.2 PSU - Black Nickel
9800pro

They've plugged everything in and when they power up all lights are on and fans spin etc. However they don't get to a bios screen. I've asked them try the ram sticks, but this didn't help. even putting no ram in didn't give errors beeps. Interestingly, they only connected one large power cable to the mobo, with an extra 4 pin in the fans begun to spin but then stopped and nothing happened. any ideas?

Camalot · 15 Jun 2007 at 12:54

Are you trying to boot off a sata drive or IDE?

Going to Cali · 15 Jun 2007 at 13:06

My Dad' plugged in a sata and an ide I believe, but surely that isn't the problem when it's not getting to the bios?

--------------------------

Update, my bro's tried the psu with the previous comp and same symptoms. with large power it spins fans but no bios, with extra four it does nothing. Sounds like psu to me, but also can you use an atx 2.2 psu with an older style mobo? atx 2.0?

Delvis · 15 Jun 2007 at 13:11

Yeah it should work i believe...never had issues at work with that.

Have they tried re-seating the cpu? Ie take it out of the socket and re-install it?

Could be PSU but its doubtfull if the fans are spinning up...And if you mean the 4pin plug by the CPU, then that needs to be plugged in.

another thing you could try is not plugging in any un-neccesary hardware...ie hdd / cdrom / floppy / usb cable etc

Something could be shorting the board so it stops it from posting.

Camalot · 15 Jun 2007 at 13:19

If its not even coming out of stand by i would reset the cpu. But if you've tried it on a different comp and same happens then i would try a diff psu.

Edit - make sure the 20pin power connecter is plugged in AND the seperate 4pin connecter.

NathP · 15 Jun 2007 at 13:21

Try reseating the memory aswell

Camalot · 15 Jun 2007 at 13:23

Can i just add, common mistakes i used to make were, my psu has a 24pin power connecter, 4 pins come off, making it a 20pin, you must plug the 20pin into the mobo and leave the other 4pins dangling somewhere.

Its another 4pin power connecter that also plugs into the mobo, not the remining 4pins you took from the big one.

Hope that makes sense :eek:

Delvis · 15 Jun 2007 at 13:25

Camalot said:
Can i just add, common mistakes i used to make were, my psu has a 24pin power connecter, 4 pins come off, making it a 20pin, you must plug the 20pin into the mobo and leave the other 4pins dangling somewhere.

Its another 4pin power connecter that also plugs into the mobo, not the remining 4pins you took from the big one.

Hope that makes sense

My god...Hopefully you never actually plugged those 4 into the board =|....IT GO BOOOOOM...probably

Going to Cali · 15 Jun 2007 at 15:33

Ok, it's definitely the PSU. My brother's just tried his Tagan TG580-U15 580W ATX2.01 Easycon SLi Compliant Modular Silent PSU and it works fine. He's said it's because there's a difference between the 4 pin cpu power cable on his atx 2.01 and the atx 2.2 psu. Something to do with there being a triangle and a square head on the same row. I'm sorry this is a bit unclear, but can anyone clarify?

Delvis · 15 Jun 2007 at 18:13

The only reason that would be different...is because its the wrong connector =/

The 4pin 'p4' connector is universal as far as im aware. So They must be plugging in the wrong power connector.

I know some older psu's didnt come with that connector...but to have a different one is a bit weird =/

Camalot · 15 Jun 2007 at 18:27

Delvis said:
My god...Hopefully you never actually plugged those 4 into the board =|....IT GO BOOOOOM...probably

Nope lol

I actually couldn't if i wanted to, it doesnt fit. The pins are a slightly different shape. But i useed to get confused over it and leave one out and it wouldnt boot

Delvis · 15 Jun 2007 at 18:34

Camalot said:
Nope lol

I actually couldn't if i wanted to, it doesnt fit. The pins are a slightly different shape. But i useed to get confused over it and leave one out and it wouldnt boot

Heh...you would be surprised...I've seen people plug in molex connectors back to front

Going to Cali · 15 Jun 2007 at 18:48

Thanks for everyone's help. Eventually worked it out. My Bro & Dad were trying to put the 4 spare pins from the mobo connector into the cpu power socket. They had to break up the 8 pin connector into 2 fours. They won't make that mistake again!

Camalot · 15 Jun 2007 at 20:02

See! Thats what i said !

:cool: