Lately if i unplug my computer from the mains, say overnight. When i attempt to turn on next day it dosn;t want to.

I plug back in and when i push power button the power lights flashed until i unplug PC. Does this around 5-10 times. Then It will power up for a split second when i push on button. After a few goes of this is will eventually stay on. Does anyone know the problem? Could the battery on the mother board be faulty?