Please Help Meeeeeee!!

Ok I love my Mac just got one a used G3 after years and years of PC's Macs rule!! But I got up and running OSX 10.3.9 when I received it the video card was bad so put in a replacement, worked great for about 12 hours, shut it off later went to restart it black screen ok put in install disc rebooted with a C boot nada zilch zip , ok thought to self maybe new card was bad changed cards nothing still please help I love my Mac and its almost painful having to work on a PC again

U sure you used the right specced card for this G3? You might have shorted something if not done properly...

Vid card

Yes was identical in all aspects , was a replacement card and was working fine for about 10 to 12 hours, so I am stumped