ECS K7S5A Mobo acting up

[HiTek21]

I built my uncles PC a few months ago using the ECS K7S5A not sure which version and I built it using a generic case and psu and I noticed a minor problem. If you were to unplug the PSU and let the PSU Power down for a minute then replug the PSU into the outlet and turn the power on everything works fine, now heres the problem. If you shut down the PC from windows and try to re-start the computer back up it won't boot up. I can hear the Drives and fans power up but nothing will post on the screen. So at first I thought it was the generic power supply that was causing it but the other day I tried to install an Antec 250w psu into his comp and same things happened.
So I found a solution to make the computer boot up, turn the toggle switch on the back of the PSU off and whenever you want to turn the PC back on just turn the toggle switch back on and turn the computer on and it works fine. Now my question is this a BIOS problem or is it just a defective motherboard? If I flashed his pc to the latest bios would this solve any problems?

Anyone in here who owns this POS K7S5A Mobo have a problem like this?

Please any help on this topic?

Edit: Its not an K7S5A pro mobo

 

[Cerb]

Never encountered such a problem.
1) Tried switching around memory slots used?
2) Tried removing and/or moving around PCI cards?
3) You're not using the USB headers on the mobo, are you? Don't know why, but they have a habit of doing wierd stuff (save on the K7S5A Pro).

I have had this happen on occasion, but every time I began randomly adding and removing components and found it. No such problems w/ any socket Athlon mobos, though.

 

[usas423]

well...what CPU are u using?

eg..if u havea duron, a 250W psu should be more than enuf...

list ur system specs pls

 

[Grminalac]

The K7S5A is a 6 layer PCB which has higher power requirements. I had problems with it acting flaky on boot until I dropped in an Antec 350 watt PSU.

I also found I had problems when running the board using PC133 SDRAm instead of DDR, but none of the problems you describe.

 

[RedRonin]

The ECS K7S5A is not a POS, it merely needs special attention. ;-) Here, take a look at the PSU for ECS K7S5A Motherboard FAQ you'll find at OCWorkbench.com for specifics. In general, and in short, the PSU in your case needs not less than 20A on the +3.3V and 25A on the +5V (recommended 28A & 35A, respectively) , with a Total Combined Output (TCO) of not less than 180W (220W preferred) on those rails. So your basic 250 PSU will not do the job with this motherboard. Don't fret, it isn't absolutely necessary to spend $75-150 for a PSU alone to satisfy the ECS K7S5A. Look around and you'll be able to find plenty of relatively generic cases that include a 300-400W PSU with proper amperage for under $40.

HUN-YA!

Red Ronin

 

[Peter]

Originally posted by: Grminalac
The K7S5A is a 6 layer PCB which has higher power requirements. I had problems with it acting flaky on boot until I dropped in an Antec 350 watt PSU.

I also found I had problems when running the board using PC133 SDRAm instead of DDR, but none of the problems you describe.

What a funny idea, six layers needing more power. Firstly, it's a four layer board, then probably HiTek's original PSU is on the way out, and the 250W thing very probably is way too weak as well. Powerup problems come from too weak or flaky +5Vstandby rail, mostly. 1.5A required, 2A recommended, as by ATX 2.03 standard.

 

[bambam]

My started this and I spent lots of time doing all the usual stuff per the FAQ's everwhere . I gave up and now my problem is solved . I have purchased another motherboard ( not ECS ) to replace it . I am sending my K7S5A for RMA but will either give away or sell it, if actually see it again .

 

[Peter]

Unless you replace that underpowered PSU, the problem will be back. With a different board, the symptoms may differ, but it will still be there.

 

[mboy]

Yup, u need a good 350W PSU for sure with those, BIG issue around here when they 1st came out.
My wife's runs fine with a 350W enermax!!!

 

[Cerb]

Yup, this K7S5A my neighbor runs hasn't faltered yet.
250w Enlight...but it has a POS video card, which takes down the power use (It will run Prime95 all day, but on my comp wouldn't even finish one loop of 3dmark 2001)
So far only 2 of 27 made in this house have had above 300w (350w Enhance PSUs for 2 light servers).
But...I wouldn't trust most of the PSUs sitting around here that say 300w.
The combined wattage of my father's PSU, the first K7S5A, is 170w on the 3.3v+5v...but it's an Enermax.

It needs a good PSU, but that doesn't necessitate more than $35 (shipped from Newegg).
Note: Ehance 300w (20A 3.3v, 26A 5v, 13A 12v) is only $26, and the good Enhance PSU (28A, 30A, 15A and 220w combined 3.3v+5v) is $32