Motherboard / PSU problem

[am21]

I assembled a system with Gigabyte GA-K8N51GMF-9 mobo with athlon64 3500+ 1gb ram and 250gb hard disk etc

the problem i faced is failure to POST if kept turned off for few hours (OFF from main power outlet) since i had a warranty i asked my PC assembler to figure out the problem.

they simply told me that it was a bad PSU and replaced it. this happened 3 times (replaced 3 PSUs)

actually the same PSU works fine in other systems and it will work in my system if kept ON continuously. i think it is a serious problem with Gigabyte motherboards.

i did a small research and found these links :

http://forums.pcper.com/showthread.php?p=3663475#post3663475
http://www.hardforum.com/showpost.php?p=1028898900&postcount=265
http://forums.pcper.com/showpost.php?p=3672473&postcount=7

2 days later.. i asked my PC builder to replace my mobo

my new mobo model : GA-K8NF9 Ultra(Rev 2.x) nforce4 ultra/SLI
now i'm experiencing the same boot up problem. i'm currently typing this from my laptop.

Please advice me regarding this matter.

more info about my motherboards (comparison)
http://www.gigabyte.com.tw/Products/Mot...mparisonSheet.aspx?ProductID=1939,2268

 

[GalvanizedYankee]

I have subcribed to this thread, I too want to know the answer.
My hunch. ASUS is having some issues with some of their newer boards and I *think*
it has to do with cold RoHS solder joints (lead free). It just might be in a rush to market
Gigabyte did not get the production set-up right. MB capacitors must have very low ESR,
a cold joint at a cap leg will raise resistance and ESR, driving the cap way out of spec.
I would think this would have greater impact at boot(inrush current) vs an idle condition.

Good luck.

EDIT: Did you search our motherboard forum?

 

[am21]

Originally posted by: GalvanizedYankee
I have subcribed to this thread, I too want to know the answer.
My hunch. ASUS is having some issues with some of their newer boards and I *think*
it has to do with cold RoHS solder joints (lead free). It just might be in a rush to market
Gigabyte did not get the production set-up right. MB capacitors must have very low ESR,
a cold joint at a cap leg will raise resistance and ESR, driving the cap way out of spec.
I would think this would have greater impact at boot(inrush current) vs an idle condition.

Good luck.

EDIT: Did you search our motherboard forum?

I just skimmed the thread but didn't notice any similar issues. This problem is quite popular on Gigabyte and Asus motherboards. I am planning to take my system back to the PC builder and see if i can get it repaired or replaced. I have already tried 2 Gigabytes and 3 PSUs (as mentioned above)