Seeking fo ur help..

, yesterday night my laptop was in good condition but today morming when.i tried to turn it on,the screen was blank but the sybol lights were on.. after a while my one of the light went off for 2 seconds and turned.on again... i had tried hard reset .but it didn't went right... i .am.afraid if motherboard is crashed or something like that..i dont wana spend.money again on it. is motherboard repairable or do we have to change it.. what will.be the cost of motherboard??? .plz.help.me..