PC auto turn's off and on

[AMKKAM]

Hi,

When turning on my PC, it suddenly turns off and then turns on automatically for a little longer than the first time, turns back off, then turns on again and shows American megatrends. My option now is to press F1, which takes me to bios. I have already setup my boot device, so I just press esc and then boot to my Windows normally.

I have a habit of turning off the PC's main power supply's switch after it is completely shut down. A little back story from a few months, or, if not a year ago,. While the PC was in the process of shutting down, I accidentally switched off the main power before the Windows shutdown. Since then, this whole thing has started. 

Any kind of suggestion is helpful. 

[TatamiMatt]

2 minutes ago, AMKKAM said:

Hi,

When turning on my PC, it suddenly turns off and then turns on automatically for a little longer than the first time, turns back off, then turns on again and shows American megatrends. My option now is to press F1, which takes me to bios. I have already setup my boot device, so I just press esc and then boot to my Windows normally.

I have a habit of turning off the PC's main power supply's switch after it is completely shut down. A little back story from a few months, or, if not a year ago,. While the PC was in the process of shutting down, I accidentally switched off the main power before the Windows shutdown. Since then, this whole thing has started. 

Any kind of suggestion is helpful. 

Those switches arent meant for continual use and will break much earlier than you expect them to because of this, theyre simply not rated for so many uses, i would just turn ff the whole thing at the wall after powering down if you want to cut all power to the PC. Other than that im not too sure on the issue, but just an FYI for the switch usage

[Alex Atkin UK]

20 minutes ago, AMKKAM said:

Hi,

When turning on my PC, it suddenly turns off and then turns on automatically for a little longer than the first time, turns back off, then turns on again and shows American megatrends. My option now is to press F1, which takes me to bios. I have already setup my boot device, so I just press esc and then boot to my Windows normally.

I have a habit of turning off the PC's main power supply's switch after it is completely shut down. A little back story from a few months, or, if not a year ago,. While the PC was in the process of shutting down, I accidentally switched off the main power before the Windows shutdown. Since then, this whole thing has started. 

Any kind of suggestion is helpful. 

Some boards can behave like this from a completely powered down state.

 

Have you tried NOT turning the PSU off by the switch to see if this prevents the problem?

 

 

[Kid.Lazer]

Check your CMOS battery. A desktop system is not meant to be in a un-powered state for long periods of time. The 3v battery on the motherboard is meant to keep your time and settings when there is no power connected for short periods, not all day every day.

[AMKKAM]

54 minutes ago, Alex Atkin UK said:

Some boards can behave like this from a completely powered down state.

 

Have you tried NOT turning the PSU off by the switch to see if this prevents the problem?

 

 

Never tried that.

forgot to mention this,The American megatrends and turning on and off only happens for the first time of the day and if i turn the pc back off and turn them back on it just goes to boot normally.
 

 

[AMKKAM]

47 minutes ago, Kid.Lazer said:

Check your CMOS battery. A desktop system is not meant to be in a un-powered state for long periods of time. The 3v battery on the motherboard is meant to keep your time and settings when there is no power connected for short periods, not all day every day.

I have heard of CMOS battery is the fault here, it basically can't hold charge anymore and to replace it.
I don't know have to check.

[Alex Atkin UK]

3 minutes ago, AMKKAM said:

Never tried that.

forgot to mention this,The American megatrends and turning on and off only happens for the first time of the day and if i turn the pc back off and turn them back on it just goes to boot normally.

That to me suggests the motherboard is using a rechargeable CMOS battery and its not getting charged enough to last overnight.  It doesn't necessarily need replacing, just needs to be left with the PSU powered on long enough to fully charge it.

[AMKKAM]

3 minutes ago, AMKKAM said:

Never tried that.

forgot to mention this,The American megatrends and turning on and off only happens for the first time of the day and if i turn the pc back off (not by switching off the psu just normal shutdown) and turn them back on it just goes to boot normally.
 

 

 

[AMKKAM]

3 minutes ago, Alex Atkin UK said:

That to me suggests the motherboard is using a rechargeable CMOS battery and its not getting charged enough to last overnight.  It doesn't necessarily need replacing, just needs to be left with the PSU powered on long enough to fully charge it.

This is the CMOS on my mobo.

rechargeable CMOS battery?

 

[Kid.Lazer]

If you have a voltmeter, you can check it, though for the low cost, you might as well plop a new one in and see if your problems go away.

 

That said, just leave your PSU turned on from now on. The power draw when off is minuscule.

[AMKKAM]

Updates

the old CMOS batt was the fault, just installed a new CMOS batt.

Problem solved.