How to fix The CMOS checksum is invalid on your laptop date and time always reset

if your laptop shows:The CMOS checksum is invalid. The CMOS will be reset to the default configuration and will be rebooted. Please check your BIOS setup options to see if they change."
this also can apply if your desktop or laptop date and time always reset.
here is the solution

[SirYus]

After doing everything, i found my solution. The cmos battery wire is the problem. Glad i tried changing the wire. I was about to solder new bios chip!

[GANDANGLALAKI]

Salamat nga pala sapag suporta tayung mga TECH

[RhymeSandJournEy]

pls subscribe po kau para upload ako ng panibagong video..thank you

[joeadeleke]

Hi please help me out... My system doesn't load past the hp logo
- The legacy boot mode is black screen, so cannot load a new windows from there
- it's presently on the UEFI mode, but gets stuck at the hp Logo both with the notebook hard drive with the corrupted Windows or a bootable usb device with a new windows ISO in it.
Thanks

[jeet]

I was working on my laptop and it suddenly turned off and wasn't starting again, i didn't knew what gone wrong so i tried searching for options to fix it. I found some tricks to restart it like 30 second hold power button but none was helpful. Next day it was working after couple of tries and showed me this " cmos 502" so i updated bios and everything from the official hp website then after 15 minutes or so it turned off again and after few more tries i found this error again. Can you please tell me what is exactly wrong in my laptop is it motherboard or cmos battery????

[ThriveLC]

Can you suggest how much would the repairing cost ?? My HP laptop won't turn on but sometimes it does and shows that CMOS checksum is invalid. Please help

[darklimak]

If your laptop doesn't have separate CMOS battery like mine and your computer doesn't even turning on.

1. Hold Win key + V an press power Button
2. On Error screen press ENTER to rebot the system.
3. Go to Bios for me is F10 or ESC.
4. Navigate to Boot Options Disable Secure Boot, Clear All Secure Boot Keys, Endable Legacy Support.
5. Save and Exit for me 100% fix after all day fighting.

[jugrajsisodiya]

Sir is se charging mai bhi problem aati hai kya

[AMITKUMAR-whru]

Hello sir/maddam .
Where can I found that battery . Please suggest

[anusuagangulyYT]

Question: I cannot turn on my laptop just by pressing the power button, even when the laptop battery has charge.
Always have to plug in the external power then turn on. After that i can remove the plug in and it works fine.
I have already updated the BIOS. Also my laptop battery is new.
But everytime i try to switch on this happens and shows me CMOS Checksum invalid.
What do i do?

[catsofjoy]

Very informative video. Thank you for sharing.

[marilexsoriano]

I love this video..very informative..keep it up

[N__Name__]

THE ANSWER IS: "CHANGE THE INTERNAL BATTERY"

[GANDANGLALAKI]

Tamang tama may sira akong laptop pre....wala ako

[amrishabirin]

mau nanya sebenarnya penyebabnya kenapa ya mas tiba2 cmos checksum is invalid?

[siko]

Not fixed still same issue any other option?

[ManishKumar-ufmq]

Hi bro
I need a help
My laptop(hp pavilion x360) is not switching on just the power button light blinks once and then nothing not even the fan is starting.
Then when i put the laptop in Air conditioned room for about 15 mins
It somehow starts but i get checksum is invalid
Cmos error 502
I saw many videos for the solution if this it all ends in changing cmos battery
I went to a repair centre where i found out that there is no cmos battery on my motherboard.
In that case what to do

[gtclanz]

Thanks for sharing your useful tutorial lods.

[EERIE]

thanks for sharing, now i know how to reset🤣

[someguy]

Im to young for this but hold press esc works