PSU woes, need advice on a replacement

[Tyrael64]

Ahoy, folks. I'm having trouble with a computer I've recently built. With all the oodles of games coming out soon, I figured it was about time to upgrade the old thing. I've got:

Case: CoolerMaster "Wavemaster"
http://www.pcstats.com/articleview.c...id=1552&page=6

Processor: Intel Core 2 Quad Q6600 2.4 Ghz
http://www.newegg.com/Product/Produc...82E16819115017

Motherboard: Gigabyte Intel P965 LGA775
http://www.newegg.com/Product/Produc...82E16813128042

RAM: 2GB (2x1GB) Kingston DDR2800
http://www.newegg.com/Product/Produc...Tpk=KVR800D2K2

Power Supply: Silvertone ST75F
http://www.newegg.com/Product/Produc...6009&Tpk=st75f

Graphics Card: GeForce 8800GTS 320MB
http://www.newegg.com/Product/Produc...Tpk=PVT80GGHD4

I've also grabbed 2 hard drives (one 320GB and one 500GB) in addition to my two old hard drives (two 160GB drives).




All of the above parts have already been bought and purchased. Anyway, here's the problem. I assembled the whole rig together, but when I turned it on, nothing happened. We tried several things, including testing with a volt meter, only to conclude that we weren't getting proper voltages in the cables, and sent it back and got a replacement. When the replacement finally came, I plugged it in, hooked up the new hard drives, got everything up--AND IT WORKED! However, since the hard drives were blank, there was no Operating System on it, so I had to turn it off and plug in the old drives. When I pressed Power--boom, nothing happened. No case fans, no nothing.

This is the second power supply that's blown out on me, and I'm rather ticked. I've talked to a friend, and he says that I wasn't getting enough amps under the 12v. The side of the power supply reads as follows:

MODEL NO: SST-ST75F
750 WATT POWER SUPPLY W/PFC

AC INPUT: 115 - 240Vac , 60 - 50Hz , 10 - 5

OUTPUT: +3.3V +5V +12V1 +12V2 +12V3 +12V4 -12V +5Vsb
MAX(A) : 24A 30A 18A 18A 18A 18A 0.5A 3A




According to my friend, I should be getting 24V under 12V, not 18V under 12V. Anyway, I'm thinking of getting an entirely new PSU, as I'm rather fed up with the whole business. Any thoughts?

 

[RetiredChief]

Not sure what you mean by " getting 24V under 12V". You probably know, But I'll mention just incase. Computer P/S (Switching power supplies) require a minimum Load when checking voltages. Voltages should read rated value plus/minus about 3%.

 

[Tyrael64]

http://images10.newegg.com/NeweggImage/productimage/17-162-014-05.jpg

Observe the right-hand column under the Voltage column. It reads "+12V" on top and "24A" on the bottom, as oppose to my current:

http://images10.newegg.com/NeweggImage/productimage/17-256-009-05.jpg

which reads "+12V1" on top and "18A" on the bottom.

 

[RetiredChief]

The 1st PSU shows a single 12V rail rated at 24A, Probably under powered for your system. Even though it is rate at 650 W, 250 Watts are for the 5V rail. The 2nd P/S show 4 12V rails, each rated at 18A - You NOT get 18 A on all 4 12V rails, BUt P/s Should be more tha adiquate for you system - DON'T know about Quality of said P/S

 

[geofelt]

From the second image, it says max load 650w for the combined 12v rails. That is 650/12 =54a which should be plenty.

Try assembling the parts with minimal peripherals outside the case. You might have a short.

 

[zenmaster]

My guess is a short as well.

Oddest short I ever had were (4) Fujisu SCSI Drives.
All 4 had the same issue and likely from the same run.

They would not work in the case, but did if I held them in my hand.
I had to wrap place electrical tape down the sides before installing them into the server.

 

[mad-dog]

I'm bummed that your having problems with you PSU and not to change the subject but why did you get mismatched HDD's, in any RAID configuration the total storage capacity in GB's of all the drives is based off the capacity of the smallest drive which is 320GB............the 500GB was a waste of unless you intend to run only 1 drive.

 

[Tyrael64]

Simply because I'm not running a RAID.

Short is what I'm thinking, too.

Just realized I never posted the actual PSU itself: http://www.newegg.com/Product/Product.aspx?Item=N82E16817256009&Tpk=st75f

In any case, I'm rather fed up with the business, and looking around for a new one.

 

[paq7512]

I have that psu and it is awesome.