I have an Acer Aspire 5755G and a few days ago when I came back home it was in sleep mode but wouldn't turn on. I turned it off and on again and got a message like " No bootable device. Insert a bootable cd/dvd and press any key". I went to bios and my hdd was detected there so i restarted it to try again. I got the same error message so I put a windows 8 dvd in and booted from it. There were no partitions detected so I did the same thing again and started formatting the C drive. Sadly it froze there (i think) so after about 30 mins I turned it off. Since then windows setup won't find any partiotions even if I load the drivers. The "list disk" command shows nothing and chkdsk only says that the drive is NTFS. I've tried changing from AHCI to IDE sata in the bios (although i have no idea what it means) but nothing seems to change. I've also tried plugging in and out the hdd. Sometimes (in rare occasions), if the hdd is seen in the boot menu it boots from it but if i choose repair it says that the drive on which windows is installed is locked.
I'm not sure if it's a hardware or software problem. Any suggestions?
Thanks in advance