Ruddman20 :
I didn't "swap" my CMOS battery but I did remove it for quite awhile to reset it to no avail. I'm now starting to think it is motherboard, [
CMOS battery stores parameters (that the BIOS first uses on power up) only when power is off. If CMOS battery is defective, then clock has wrong date time. If BIOS does not like those CMOS parameters, then it uses its own default parameters, verifies memory and other parts, and then boots the system. IOW all CMOS information after an initial read is irrelevant.
You have as much reason to suspect a motherboard as you do everything else including GPU, keyboard, any USB devices, and monitor.
Dell is one of few manufacturers that provide hardware diagnostics to actually identify failures. Diagnostics that execute without any OS. BIOS is only a quick and dirty configuration check - not a very good diagnostic.
Using a meter as described provides numbers that identify or exonerate suspects - including the power controller. Most every failed part has no visual indication. Without those numbers, the fewer who even designed computers can only remain silent. Leaving shotgunning as your only alternative.
If not using a meter as recommended, then just start randomly replacing parts until the anomaly stops. Without those numbers (or those superb Dell hardware diagnostics), then nobody can say what is or is not defective.
Only item that causes a PSU to power off is the power controller. Not CMOS battery, memory modules, or anything else.