Thanks for following up buddy.
I tried it, but it didn't make any difference. But I did observe one thing that voltage indicated is getting incremented slowly.
What I can infer from the above though not sure is that something (either the PSU/mobo's voltage monitoring circuit) is getting degraded slowly.
Here are the pics:
Just after reset to defaults & removing the battery for about 20mins & doing all the above steps you had given.
After changing the date to reflect the current date.
I haven't been able to take the system to prime as I unfortunately am not getting any time for the same as of now.
But if you have any other test in mind that I could do I'll be happy to give it a try.
I am trying to test the output of the PSU using a multimeter(DMM). But I am not sure if it would be safe as I can't surely say what's wrong with the PSU.
If you or #[member='cranky'] could just tell me(from experience i.e. if you have tried it before) if it would be safe to check it using a multimeter as the symptoms show PSU's overvoltage protection circuit is not kicking in to stop voltages to go as high as 7V on a 5V line.
Or maybe the motherboard is fooling me into thinking that my PSU is gone bonkers.
Awaiting your reply, Thanks.