Dell inspirion 1525 black screen?

Ok it's seems your hdd goes bad. Go into the bios f2 and check if your hdd is recognized by bios. There is maybe a hdd check to you have to run them to. IF hdd fails you still can try hdd regeneration software or just find someone to repair physical bads on hdd. Or just buy a new one it's pretty cheap. But 1st be sure it's hdd fault