PC won't POST after shutdown

[TimBru14]

We had loadshedding a few weeks back and I didn't have time to shut down my PC properly before my UPS died. I left it off for a few hours and then when I came back to it, it wouldn't POST.
Removed all the RAM and placed them in different slots and suddenly the PC fired into life. I'm a little confused now as all my RAM shows up and the PC runs 100% but if I shut it down and then try and start it up again (from a complete shut down), it will not POST but if I simply restart it, it will work great. The only thing that seems to fix this is re-seating my RAM in different slots.

Can't tell if RAM is dead or maybe the slots are dying?

Any ideas?

 

[subok]

I have exactly the same problem with the same temp solution, the pc will only start if I reseat the RAM. The pc will then run non stop until the next power failure, reseat the RAM and it starts.

Sorry I don;t have any advice but I will keep an eye on the thread maybe someone else does.

 

[eyetac]

Have you tried re-setting the bios?

 

[Dom]

I have exactly the same problem with the same temp solution, the pc will only start if I reseat the RAM. The pc will then run non stop until the next power failure, reseat the RAM and it starts.

Sorry I don;t have any advice but I will keep an eye on the thread maybe someone else does.

BIOS update?

 

[TimBru14]

Have you tried re-setting the bios?

Removed CMOS battery to clear BIOS and then tried. Doesn't make any difference unless I remove and re-seat the RAM.

BIOS update?

Currently running latest BIOS version according to ASUS' website (Z97-K/USB3.1 BIOS & FIRMWARE | Motherboards | ASUS South Africa)

 

[∀Z‾soʇɐuɐɥ┴]

Sounds similar to a issue I had on my 2700x setup where after a few rounds of loadshedding pc would just refuse to boot on start-up, and resetting it sorta worked sometimes.
Turns out in my case there was something funky going on with the case/board etc and taking the parts out of the case caused it to boot perfectly.
Parts were sold on Carb and as far as I know the guy who bought it never had any issues with it from the start.

To my point. Remove everything from the case and see if it will boot correctly/

 

[eyetac]

Removed CMOS battery to clear BIOS and then tried. Doesn't make any difference unless I remove and re-seat the RAM.



Currently running latest BIOS version according to ASUS' website (Z97-K/USB3.1 BIOS & FIRMWARE | Motherboards | ASUS South Africa)

Perhaps try reflashing it again.

 

[Billabomb75]

Perhaps your Power Supply, I know it sounds dumb, but try swapping your psu and boot without a GPU if you can ?

 

[souljazk]

Perhaps your Power Supply, I know it sounds dumb, but try swapping your psu and boot without a GPU if you can ?

Not dumb at all. @TimBru14 AFAIR when a PSU reboots, the capacitors don't flush fully. When you shutdown, they will flush fully / more than when rebooting. So I also say check your PSU. This does not answer why removing the RAM seems to fix the issue. HAve you tried to disconnect the system form the mains, and hold in the power button for 10 seconds to flush the system of any & all power.

Have you tried a different plug in the house (kitchen is usually good due to a stove/fridge etc being installed) aswell as a different PSU cable (try get one with a red plug).

 

[TimBru14]

Perhaps try reflashing it again.

I'll try again and let you know. I have reason to believe that it may just tell me that the BIOS version on the flash drive is the same as the one installed but cannot hurt to try.

Perhaps your Power Supply, I know it sounds dumb, but try swapping your psu and boot without a GPU if you can ?

Don't have a spare PSU but could test at a friend's place. When the problem first started, I removed my GPU and tried booting without it but got no display from onboard graphics (even after resetting CMOS).

Not dumb at all. @TimBru14 AFAIR when a PSU reboots, the capacitors don't flush fully. When you shutdown, they will flush fully / more than when rebooting. So I also say check your PSU. This does not answer why removing the RAM seems to fix the issue. HAve you tried to disconnect the system form the mains, and hold in the power button for 10 seconds to flush the system of any & all power.

Have you tried a different plug in the house (kitchen is usually good due to a stove/fridge etc being installed) aswell as a different PSU cable (try get one with a red plug).

The system runs through a small UPS. When loadshedding strikes, I have to unplug the machine from the UPS and connect to an extension cord which then connects to our small inverter. I have noticed that when running on inverter power, the PSU will make a definitive buzzing sound which does not happen when on mains or on the UPS.

I'll try run the extension to a plug in the kitchen to see if it makes any difference.

 

[souljazk]

I'll try again and let you know. I have reason to believe that it may just tell me that the BIOS version on the flash drive is the same as the one installed but cannot hurt to try.



Don't have a spare PSU but could test at a friend's place. When the problem first started, I removed my GPU and tried booting without it but got no display from onboard graphics (even after resetting CMOS).



The system runs through a small UPS. When loadshedding strikes, I have to unplug the machine from the UPS and connect to an extension cord which then connects to our small inverter. I have noticed that when running on inverter power, the PSU will make a definitive buzzing sound which does not happen when on mains or on the UPS.

I'll try run the extension to a plug in the kitchen to see if it makes any difference.

Check the frequency, I have read (cant confirm) that there can be issues if one device is running 220v 50Hz & another 220v 60Hz. I'm not an electrician, so sorry if this is a bit vague.