PcBytes wrote on 2024-12-20, 23:12:I'm more than confident I have checked everything out. […]
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I'm more than confident I have checked everything out.
I have a dead Rev2.1 board (which the newer SST 39SF010 chip actually came from) and was able to pinpoint my POST-ing board to being the earlier 2.0 revision.
I got my BIOS off Jan's page, however the issue has been present with the original BIOSes as well (1.15JI31S for my "working" board, 1.15JI37S for the dead one).
The only thing I have not tried is downgrading the BIOS core version (4.60PGA) to the older 4.51PG that seems to be on TRW.
As for my revision, it's definitely a Rev2.0 board. There's no 2.0 E-0036 sticker anywhere.
It was worth a shot. 😀
These are nice boards. I hope you can get it sorted out.
Since it is able to get through POST, that probably rules out a lot of things... but what is left is certainly puzzling. I'm wondering if one small component of supporting logic on the board has failed.
A bit of quick googling on this issue seems to turn up some posts about cache-related problems, but I know you have disabled the onboard cache already. Keyboard or keyboard controller issues may also be another possibility.
Has it always been this way as long as you have owned it, and you recapped it to try to fix the problem? Or did the problem start at some point while you had it? Either way it may be worth looking at anything that could be affected by externally-introduced static discharge... like, components near the keyboard\mouse\USB ports for example. I've seen damaged components near these ports (possibly from a previous owner plugging in a PS/2 device while the PC is on) create all sorts of strange problems.
Though it is more likely to be helpful for a board that won't even POST, if you have access to a thermal camera (even a cheap one) it can sometimes help to locate components that are either unusually warm or unusually cold compared to others.
Also... you've probably checked them a dozen times, but check the jumper configuration and be sure that none of the jumpers are loose. I have seen loose jumpers also cause strange problems.