Tried to overclock and as a result system is screwed up

[dhimansumit4]

Greetings, this is my first question here.
The motherboard in question is a Gigabyte Motherboard GA78LMT-USB3
This is running AMD Athlon 2 X270 processor with 4 GB of RAM.
Windows 10 X64 if that matters.
As this is the only system of mine that had overclocking supported, I tried to Overclock the CPU. Here is what I changed:
■ CPU Frequency to 300 Mhz from 200 Mhz
■ Gave the minimum increment to the CPU voltage.most probably 0.010 or something.
Now when I restarted after saving the settings, The computer got hanged at POST. I restarted and since then I was not getting any screen into the monitor.
As a result, I tried to reset the CMOS using Jumper pins.
Success, the PC got started but it told me that checksum is bad and asked me to press a key to reset BIOS otherwise it would revert to last known good configuration in 10 seconds. Its a shame that I didn't had a Keyboard plugged in at that time. As a result, BIOS reverted to LKGC.
Subsequently, I tried to reset BIOS again using the jumper but it didn't help.
I understand that it is a fairly old PC but I would really wish that this machine should be up and running again.
Thank you for any help you provide

 

[RARRAF]

I would try tacking out the watch type battery and unplugging it from the mains leave it half hour put battery back in and see

 

[4Ryan6]

AMD CPU Frequency is 200mhz you went way too far with 300mhz, Learn First and then Do, OK.

Honestly I am amazed you originally got it to even run Windows 10 X64 at all the hardware is so old.

Pull the power completely from the wall, do a BIOS reset using the CRTC (Clear Real Time Clock), pins with the motherboard battery removed, set the CRTC pin jumper back to the run configuration, reinstall the motherboard battery, make sure a keyboard and mouse is plugged in, plug in the wall power and try booting up again.

When the machine is booting hold down the delete key but in some cases it's the F1 key to, it usually tells you on the boot screen what gets you into the BIOS. You have to set the Date and Time in the BIOS because you wiped that out when you cleared the CMOS, also select set to (Optimized Defaults), when you're ready to exit the BIOS press F10 and select save and exit, and you should be OK.