|now.. out of the three asrock k7vt4apro mobos, two work and one does not. i'm gonna post the problem here being a hardware discussion, and hope that someone can hint at the defect.|
i first put in a good asrock, with ram+video+psu and made sure all these were OK. then I took it out, and slid in the case the bad asrock. used the same components, cleared cmos, replaced cmos battery, and then i plugged in the power cable into the psu. the board started without me pressing power on the case. i then took out the pwr switch from the mobo, and re-plugged it in. same thing, the mobo starts without any ON signal from me. the psu fan runs, the cpu fan runs, i hear no beeps, and even if i short the pwrbtn connectors for 15 seconds, it won't turn off. all the jumpers on it were set as on the working mobo. i checked the capacitors appearance, they look fine, no swells or leaks visible to the normal eye. any suggestions?
can it be from the bios? maybe someone tried flashing it and didn't do it right? would a problem like that keep the board powered ON ? but not POST-ing ?
and if that were the case, i wonder if I can lend this board a bios chip from the other two asrocks? i need to mention that a few characters differ on the bios chip label, and i'll list them as well as the other things that differ now:
next to the audio outputs, the three colored combo, there's a brown encasing with a black chip slid into it(looks removable), i'm assuming this is the bios chip. it reads :
k7vt4a pro p1.50 - non-working mobo
k7vt4a pro p1.40-9B - working mobo1
k7vt4a pro p1.30-8A - working mobo2
between the bios chip and the first pci slot, there's a black chip soldered on the board, it reads:
-winbond w83697hf - 447l5b24393010ub - non-working mobo
-paper label over, can only see the winbond logo under it, and it reads 80-mxa 1x0-a21 02-a21 e80-550126-1 03359 - working mobo1
-paper label over, can only see the winbond logo under it, and it reads 80-mxa 1x0-a21 02-a21 e80-550027-2 01854 - working mobo2
there's also a black 'box' it may be a cover for an onboard chip, right behind the usb+usb+LAN outputs.
-a logo looking like.. LB 16pt8515-4 0444s - non-working mobo
-no logo, TAIMAG he-012d 0520b - working mobo1
-a logo looking like.. LB 16pt8515-4 0520L - working mobo2
the last difference is consisted of the different sticker labels on the pink serial port:
- id=000b6ab61a53 4cm4wb6589 - non working mobo
- id=00138f070c40 55m1w73834 - working mobo1
- id=00b6aef8854 55m1xd5689 - working mobo2
okay, some of these numbers may be simply serial numbers for the products, i don't know which. others may indicate whether or not i can change a bios chip from one to another mobo.
and is there a point in trying that? i heard it's called hotswapping ? i know nothing about it.
I always say it's best to doublecheck.