PS4 Not booting up

My station was working just fine up until going to bed the other night, put it into sleep mode as usual, and when i woke up, it just would not start. The light goes from blue to white, but the tv is flashing between black and not so black screens, the latter having a resolution of 720x576 @50Hz according to my tv....whatever that means...I've turned everything off, unplugged/replugged everything, tried to enter "safe mode" but no dice, tested the hdmi and tv on something else, and all works good...even checked the hdmi port for damage....I'm leaning towards hdd failure, and have ordered a newy, and if its not that, I will have a spare 2tb drive, so whatever...