So I have only 1 old seaget hdd and it is in my frontech motherboard
It shows A2 but I can access BIOS but my hdd is not detected by my BIOS some time after 8 hour of inactivity it may start or it maynot
Sounds like your HDD might be dying or dead. Might want to take the drive over to a donor system and see if the HDD is detected in donor system's BIOS and then allows yuo to access the data on it. Make and model of your PSU and it's age? Mind sharing the model for your Frontech motherboard?