|You might still be covered under warranty - even if a little over one year old.. Depending on where you're located warranty terms etc. both vary and also have some built-in flexibility - not the least in UK and Europe.|
Might be worth leaning on the vendor/manufacture at least to see what might be possible?
Are you able to remove the hard drive at least; and then perhaps connect it via usb adapter to another computer? If so then you can both verify the drive is basically OK; and even copy any personal files to external storage (DVD etc.) as a safeguard.
Once you have your files copied safely elsewhere, anyone then working on the computer (locally or wherever) will then not put your files under threat...
Can you access bios settings? If so then try reseting them to defaults at least?