Gateway gt motherboard failure
Yeah that's right. Change/replace the power supply. Yet, you have to test the power supply's conditions if it still works alright. since you are suspecting both motherboard and HDD first. If yellow light comes and no action to the whole machine then that must be something in the motherboard. Before you finally follow your decision to change the power supply, check the motherboard. There are capacitors and examine if it didn't bloat. If it does, just take out the capacitors with exact microfarad and voltage specs or change the whole board. And granting though that the supply is bad, there must be some electric signals that have caused to the mother board which will eventually, at the end of the day, you encounter the same problem with it.
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