Laptop "burned"

Dell Vostro 1000 which accompany me through these three years UUM study life "burned" last week. Dun knw why? Because before i bring it out at afternoon, it still function normally at tat morning. But when i reached library tat afternoon, it become malfunction.Many ppl said is motherboard's problem. If really motherboard problem, then diela!Because even change a chipset on motherboard, it still need cost me RM 400-Rm500++. Nw a new laptop only cost RM1000++. My friend said his brother working computer shop gt sell a laptop in RM15000 onli. Cheaper almost RM200++ then Alor Star. Nw still dun knw want to buy it o nt? RM14000++. Dun hv so much money. Mother said she can only "sponsor" me RM500, else need to "fill" by myself. Sent the laptop to check d, bt still dun hv any reply yet. Hope tat can get the reply frm the shop 2mrrw so tat i can make a decision. God, pls help me do the right decision.