You still need to run Startup Repair up to 3 separate times.
I would reset BIOS to defaults, then test the HD with maker's HD Diagnostic
extended CD scan and Disk Check
on the full disk partition.
Did you download latest ISO and write to flash stick with tool given?
Then set HD to boot first in BIOS setup, trigger stick to boot using one-time BIOS Boot Menu key - listed under USB, Removable or HD's. The stick should boot if it's being triggered correctly.
Please fill out your System specs in bottom left corner of post. I can't provide you with Boot menu key without knowing your computer or mobo make.