i recently changey my liptop motherboard due to burning of sone main ac.s ,so called the repair man..i googled many problem but result is nil...i try many techniques and help as follow
i changed the boot pririoty to hhd but no result
i used ms-dos for ueif and legacy mode but no sucess
i used safe mode but no result
when i start pc it popup with a very common message ..reboot and select proper boot device or insert boot media in selected boot device and press a key..

i also use another liptop and with a another liptop my hhd is working properly but why not on my pc .
if you have a any experience solution then plz share with me or it need a fresh window then told me a method that i dont want to lose my activation.
my liptop detail
toshiba satllite c850 window 8
intel core i3 with 2.20 ghz and 4 gb of ram
toshiba hhd with storage of 320.
i am waiting for your kind reply

If your hdd is working with other system then check your BIOS settings. There may be some problem with the bios version installed