GB mobo, no post, no beep, no display...

[Charlie98]

10-month old Gigabyte Z68 mobo, as listed in my rig in sig. I was out of town this weekend and came home to this:

When you cold boot it, the system powers up (fans and HDD) but no POST beep. My mobo doesn't have any diagnostic LED's, so no help there. I've swapped out into a single stick of RAM, hooked up a brand new CX430 PSU, pulled the GPU, pulled all the drives from the mobo and still nothing.

I'm in the process of pulling the 2500K and dropping in a G620 (from my HTPC build, NIB) to see if it's the CPU, but if anyone has any suggestions I'm all ears...

 

[Sunny129]

only once did something like this happen to me (powered up fine, but no post, no beep, blank display, etc.), and i did more or less what you did - isolated components to see which was at fault. in my case, it did in fact turn out to be the motherboard, as i found that all the other components worked fine when i tested them in another system. now narrowing it down to the motherboard only narrows it down so much though, b/c a million different things can go wrong with a motherboard. but in thinking about what i was actually doing right before the problem showed up, i took an educated guess that the BIOS probably got corrupted. you see, just prior to the problem showing up, i was trying to find a key stroke that would boot Windows into Safe Mode. but i wasn't finding one, and i kept hitting the reset button every time i failed to find a "Safe Mode" key, thus hard resetting the machine before it ever got a chance to load Windows. and so i probably did some damage by resetting the machine while something critical was going on...and it turned out i was right. after swapping the old BIOS chip with a new replacement (which i got from some obscure eBay vendor LOL), the board fired right up just like it was supposed to - it beeped, posted, and loaded Windows just fine. i also went into the BIOS to make sure that worked too.

at any rate, i have no idea if that's actually what's going on w/ your system. but if you narrow it down to the motherboard itself, i'd say there's a decent chance the BIOS got corrupted while you were away. how? i don't know...perhaps a power surge or something. i'd check the CPU first like you were planning on doing before you start picking apart the mobo though...

 

[Charlie98]

I dropped my G620 in and got a POST beep, so now I'll hook everything back up and see if it'll run before I put the 2500K back in.

*edit* G620 worked fine.

Pulled the G620 out, put the 2500K back in, replaced the normal RAM and... voila'! Everything is fine. At this point I'm guessing corrupted CMOS or BIOS. There is an updated BIOS for my board, maybe I'll flash it if the system becomes unstable again.

I've put the system back together now and am running a few passes of LinX to check the temps. I reset my OC to where it was (41x) so if it crashes again, I'll drop the OC down a bit maybe.

Again, if anyone has any thoughts...

 

[tweakboy]

If fans and everything turn on but no picture or beep or anything. Its a damaged mobo.

You hear nothing, no POST nothing,, yes its mobo. RMA ,, or Upgrade ,, your choice....