what will the cmos battery do?
CMOS is short for Complementary Metal-Oxide Semiconductor. CMOS is an on-board semiconductor chip powered by a CMOS battery inside IBM compatible computers that stores information such as the system time and system settings for your computer.
A damaged or insufficiently charged internal battery can corrupt CMOS or BIOS settings. Incorrect or corrupted CMOS and BIOS settings can cause startup problems or shutdown problems. After awhile it doesn't retain the BIOS settings and that can lead to problems like you are experiencing now.
Sometimes when you power down the PSU doesn't switch off all the way and it is still allowing current to pass through. By removing the Power cord you are draining that current.
The ultimate test is to use another PSU and then start it first thing in the morning.
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Problem with boot up
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