Cucubelu where in the heck can u get data recovery from a failed HD for $10-40?????? that service is in the hundreds of dollars.

Theres SO many reasons a hard drive cud fail to boot. Cud just be a corrupt and easily fixable boot sector, or it cud be physical damage almost anywhere within the hard drive. Even if theres physical damage, u cud possible slave it to another working comp to recover most or all of ur files. U cud even return the physically damaged hard drive to working condition if there was a head crash by getting those sectors written off as bad sectors.

Need more info. any error messages or do u just get a blinking cursor on a black screen? does it say no OS found? is it a solid state drive or a hard disk drive? does the hard drive make any unusual noise, or does it sound like its working normally?