Mac Yosemite -not able to re-install

I have a Mac Mini which started restarting continuously. Done HW diagnostic test by pressing D while starting. But not able to go to disk utilities menu by pressing command+R as mentioned in the Apple forum. I want to go for a OS re-install connecting with internet since HW diagnosis showed no problems.
Anyone to help?
 
Do u have a Time Machine Backup on any other external Hard drives
Put the mac on recovery Mode and boot through It...
 
I dont have any access to other mac. (I will check with friends on that). I dont have time machine backup. Anyone know, a trusted and economic expert in bangalore?
 
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