Desktop Computer faults can be numerous.
No video signal No sound Faulty memory No power Fauty operating system Viruses / Trojans / Spyware Operator initiated errors conflicting software Corrupt registery The list is endless... Motherboards CAN be repaired.
Basic problems are due usually to the capacitors on the main board leaking due to excessive voltage from cheap or overdrive powersupplies.So if you want to keep your motherboard and not have the expense of a new one, then repair is an option for you.