My blackberry z10 wont turn but red light flashes

I'm not an expert on phones, but it sounds to me like that is the low battery light that is flashing, so I must ask, have you charged it recently? if not, try that and then after a few hours try turning it back on.
I hate to sound stupid, but a lot of phones will flash a red light if the battery is too low for it to turn on. so it is worth mentioning.