Why my desktop keep on and off continuously without able to use it.

Hi @melvintham

Try a power refresh in case the BIOS has become corrupted and is preventing a normal start.

Here’s the procedure:

a). Disconnect the AC power from the PSU and then open the PC case and remove the coin cell RTC battery from the motherboard.

Here’s the owner manual for the PC. Go to p.15 to view the procedure to remove the battery. Note the orientation of the battery for when you have to re-insert it. It is +ve on top - marked on battery. When the battery is removed, use a DMM (voltmeter function) to measure the battery’s voltage. If it is <2.6V DC (or if it is >4-5 years old), replace it. Usually the battery is a CR2032 Lithium coin cell battery that is available most everywhere e.g. supermarkets. Check the battery type, printed on the battery itself, to verify the type number in case it is different.

b). Press and hold the PC Power On button for 30 seconds and then release it. This will restore the BIOS back to the factory default settings.

c). Reinsert the coin cell battery (or replacement battery) - remember the orientation!

d). Reassemble the PC and reconnect the AC power to the PSU.

e). Turn it on and check if it starts OK. If it does, there may be a message on the screen about the date and time being incorrect. This is normal as the BIOS has been reset. Once the date and time have been corrected, the message won’t appear the next time that it is started.