Author Topic: Power supply question (Read 410 times)

moot · « **on:** October 09, 2006, 10:52:07 AM »

I just hooked up a new box, notably:
ASRock 939NF4G-SATA2
AMD 64 3500+
two 512MB sticks of 3200 DDR
and a Maxinpower PS-970 power supply (580W).

When I bought the power supply online, there was no mention that it is a "Prescott 775 power supply" (It says so on the box, but the picture on the website is too small to read).
The computer doesn't POST, the screen stays on standby - could the power supply do this?
Would it damage the CPU?

GunnerCAF · « **Reply #1 on:** October 09, 2006, 12:31:09 PM »

Do your fans start and does the hard dive spin?

I just wonder if it's the video card not giving a signal to your monitor (check to see it is connected right) or if it just isn't booting.

I would think your PS is big enough, but it is possible it is defective. You can always run the risk of damaging something if the PS is bad. If you don't see any fans spinning, or hear your drives try to start, I would shut it down right away and try another PS.

Your PS looks like it works with both AMD and Pentium. I see it has an ATX cable (to connect to the MB) and also P4 an P6 cables.

Gunner

Krusty · « **Reply #2 on:** October 09, 2006, 12:35:36 PM »

Correct me if I'm wrong, but the power supply should work on either AMD or Intel motherboards. The power standard is the same, right? You either get 20-pin or 20+4-pin.

Isn't AMD the same way? I know Intel is this way.

GunnerCAF · « **Reply #3 on:** October 09, 2006, 07:32:59 PM »

Krusty,

I have been building AMDs, so I don't know about Pentiums. The AMD uses the 24 pin cable for power to the MB.

The specs on Moots PS has two extra leads for a P4 and P6. I have no clue what they are for. I am not up on power connections a Prescott 775 needs. I looked at a P4 MB at New Egg and it looks like it also has a 24 pin connection.

Gunner

Wardog · « **Reply #4 on:** October 10, 2006, 12:37:25 AM »

Moot

Cant find any reviews in English on the Maxinpower PS, but looking at the specs on there site you should not have a problem with it.

The (Prescott) statement means it has the P6 connector for the Intel Boards. Its a P20 + P4 that hook together for a 24 pin connector. Alot of PSUs have the P4 as a detachable clip on to the P20.

This should be fine on the AMD.

But you didnt mention what Video card you have, as some do need a P6 connector for power.

straffo · « **Reply #5 on:** October 10, 2006, 02:31:32 AM »

did you plug this

??

it's right over the CPU socket

Tu dois brancher ce truc a coté du socket du proc. au dessus des condo pas loin des 3/4 bobines en cuivre.

Attention aux couleurs! c'est noir et jaune !
Il ne faut pas le confondre avec la partie détachable du connecteur 20/24 qui va sur la mobo

le machin détaché qui est à droite sur cette photo : http://www.highpowersupply.com/icon/20+4main2.jpg

moot · « **Reply #6 on:** October 10, 2006, 03:55:48 AM »

Thanks for the responses,

Everything spins up normally, only there was no post last time I tried. The speaker I have didn't match the pin configuration on this motherboard, so at the time I didn't have it plugged in; although it is ready to be used now, if there's no doubt I'm not frying anything the next time I turn it on.

Yes, the CPU's square plug is in its place, the extra plastic square of 3 pins (from the large 20-pinner) which is supposed to go to the PCI-E card (none here, onboard chipset is what's used) is left alone.
So was I supposed to plug in the PCI-E's (3-pin IIRC) square plug anywhere near the motherboard's integrated gfx chipset? That doesn't sound right

I tried again with only 1 stick of ram, and no HDD, and it didn't work either.
When I get back to it in a few hours, I'll double check all the connections and try floating it, I guess.
Would 22A on the +12V line be normal for a 580W PSU? I have no multimetre with me, but that's what the webpage specs say.

I'm having a string of bad luck with computers, despite taking every precaution (static discharge etc), so I may just let a pc graveyard shop diagnose it...

Any other ideas?

TexInVa · « **Reply #7 on:** October 10, 2006, 05:26:08 AM »

Do you have another PSU you can use to test the mobo?

The Fugitive · « **Reply #8 on:** October 10, 2006, 06:16:43 AM »

The newer MBs MUST have that 12v plug plugged in that Straffo has pictured. The PCI plug of course doesn't plug in to anything if you have no PCI card. The book that came with the MB should have the info for which pins do what for the speaker, and it is very easy to move the wires around on the plug. Running it without a keyboard HAS to give you a "post" error, but you'll never know unless you have a speaker connected.

Krusty · « **Reply #9 on:** October 10, 2006, 10:01:14 AM »

If things spin up the PSU should be working.

Even if you have a 24-pin mobo connector, you might get away with a 20-pin plug (for example the ASUS P5P800 my sister now has works fine with only 20 pins, as long as the juice is good).

Things to consider:

- PC in properly?

- RAM in the proper bank? Check manual. My other sis has a PC that won't boot with ram in bank 1 but not in bank 0.

- Case switches plugged in PROPERLY (check manual! Very important! Can vary from case to case to case!) Get the PWRSW ("power/soft switch" I believe it's called) in the proper place or you just won't even turn on when you press the case "on" button.

- Pull all PCI cards you don't need. Yank everything. See if you get a POST.

- does it SOUND like it's starting up? MAybe your onboard video is just not working? That is does it spool up and sound like it's doing things a mobo does on startup?