Asus Sabretooth z77 won't pass POST after failed overclock attempt

[STTEOTD]

Tried resetting RTC RAM twice and MemOK! switch twice as well, no good. I just rebuilt my computer last night after a cleaning out and cable management session, everything booted back up perfect, was on there for hours before shutting down for the night. All I did was go into BIOS to set up the default higher performance option and when it restarted, it won't even give me a beep.

 

[alexoiu]

Was the power cord unplugged when cleared the CMOS?
If yes and still the same, try starting the board with no RAMs installed. See if any beeps.

 

[STTEOTD]

Was the power cord unplugged when cleared the CMOS?
If yes and still the same, try starting the board with no RAMs installed. See if any beeps.

Removed the RAM, got some beeps. One long one, followed by two quick beeps.

 

[alexoiu]

Then board and CPU do work. Now insert single RAM module, remove the graphics card (connect the monitor to the onboard) and see if POST-ing. Check each RAM module and each slot.

 

[STTEOTD]

Then board and CPU do work. Now insert single RAM module, remove the graphics card (connect the monitor to the onboard) and see if POST-ing. Check each RAM module and each slot.

Really appreciate your quick response. Give me a couple minutes to try this and I'll respond again.

 

[alexoiu]

No problem.

 

[STTEOTD]

Then board and CPU do work. Now insert single RAM module, remove the graphics card (connect the monitor to the onboard) and see if POST-ing. Check each RAM module and each slot.

No good with each stick in each slot, no beeps and no POST. Tried removing the graphics card which didn't help either unfortunately.

 

[alexoiu]

Did it use to give single beep when successfully POST-ing?

 

[STTEOTD]

Did it use to give single beep when successfully POST-ing?

Yes just a single beep when it was booting properly.

 

[alexoiu]

Then try testing different RAM module if possible (try borrowing one). If still no go, it might be a CPU issue.

 

[STTEOTD]

All four RAM sticks work, tested them on my roommate's computer. Graphics card also works on his PC as well.

 

[alexoiu]

Try unplugging the power cord and removing the CMOS battery for a minute. If still no go, then try testing board and CPU at a local shop.

 

[STTEOTD]

Try unplugging the power cord and removing the CMOS battery for a minute. If still no go, then try testing board and CPU at a local shop.

Will do. Gotta figure out how to get the thermal plate off... Lol may take a few minutes again.

 

[STTEOTD]

Tried taking the battery out and it's still not passing POST. I'm stumped, not sure what else to try.

 

[alexoiu]

I suspect the CPU. Try testing it at a local shop.

 

[STTEOTD]

I suspect the CPU. Try testing it at a local shop.

I was hoping it wouldn't come to that. I'll take it in to have them look at it, thanks again for your help.

 

[alexoiu]

No problem. Please post back the result.

 

[STTEOTD]

Just another thought while I'm looking around inside the computer... Two questions really. I left the CMOS battery out for maybe 30 seconds, would it make a difference if I left it out longer? Also, the motherboard clearly is getting power, so I'm guessing a separate power supply wouldn't be a solution?

I just find it odd that one preset would kill my cpu when it's been perfectly fine for its entirety... I feel like if I could get back into BIOS and reset the overclock back to normal (since the jumper twice didn't seem to do anything) it would boot normally.

 

[alexoiu]

"I left the CMOS battery out for maybe 30 seconds, would it make a difference if I left it out longer? "
No. Even 10-20 seconds are enough .
"Also, the motherboard clearly is getting power, so I'm guessing a separate power supply wouldn't be a solution? "
Since getting the beeps with only CPU and CPU fan installed, then I'd rule out a power issue.
Try removing all components but CPU, CPU cooler, single RAM module and DVD drive (monitor connected to the onboard).

 

[STTEOTD]

No problem. Please post back the result.

Took it in for a diagnostic test, motherboard was fried. Unfortunate turn of events.

 

[alexoiu]

Thank you for the follow-up.