Help Needed - Lenovo Y500

Hi All

Firstly, in advance i appreciate any help offered.

I recently changed my operating system on my Lenovo Y500 Ideapad to Win7 from Win8 - i had to mod the bios (the WLAN was also flakey so changed this too). This went successful. I recently changed something in the bios and i may of changed something i didn't mean to as it just goes into a loop before bios (power comes on then reboots before lenovo logo). Is there a recovery mode that works anywhere?

I have recently tried fn+r then power on with my bios usb in and it doesn't show the usb flashing although it doesn't loop and the fan is perm on.

Any help would be appreciated, even if its a 'you broke it' reply... at least it would save me time trying to fix it. I also know that this may of been due to my own stupidity, but hey, if we could all turn back time life would be so boring

edit: fyi i would of voided the warranty modding but even though i could of restored previous BIOS, the warranty period has expired by 4 months and i cannot even get into the bios at present

Thank you in advance!