WELCOME, NewbieCake....lov the name..hahaha
Sounds like you are on to it..the Power supply.
I would check all the connections..make sure..
they could have been making contact..a slight move,
or the heat could be just enough..hey, it could happen..
and before you shell out another $100+ bucks..best to be sure.
Also, turn the power strip off, wait a few seconds and hold the
power switch (on the case or mb) for a few seconds to drain the
system...check your connections and try to boot again.
This is odd behavior..and probably something simple..
If this dont work..Try another PowerSupplyUnit.
If that dont work. We will be here..
And once it does work..dont forget to come back .. tell us about it..
and get to know, and learn from the other members...and hopefully
teach us a new trick or two.c.