What do you mean by nothing? It doesnt turn on at all or it does but you get a blank screen? Is there any beeps. If the computer was still on in the morning aswell as the fans as usual than it seems like it didnt overheat, and the power supply must still be working. Try taking out the soundcard if its not totally onboard and try booting, than try taking out and swapping RAM, try using only 1-2 sticks.
I noted that you didn't specify what your PSU was. There are tons of post on PSUs and the quality ratings of some are very bad. For what its worth even good PSUs fail quickly, just not as often as some of the ones that should only be used as door stops.
If you are unsure of your PSUs rating try doinf a google on it and look for some reviews.
The Biostar TA780G M2+ is apparently plagued with faulty SATA controllers which seem to fail randomly after 1 year or so of ownership. Do a google search on the motherboard and SATA controller and see what you come up with. That said, I do not know if this is your problem but it sure sounds like it.
Apologies for bringing such an old thread up again, I've been away for ages and only recently finished my dissertation thus a lack of free time!
Following the helpful posts here, I went and bought a new motherboard, an ASROCK A790GMH/128M
Again I stress that I have not had much time recently to fiddle around with things, but after I installed the new mobo I still had the same problem that it would not boot (fans, leds, GPU and HDD all have power) with nothing being displayed on the monitor.
This had led me to the conclusion that it is probably the CPU (again sorry old thread, wrong category) but having just spent what little money I have on a mobo I may not have needed, I am reluctant to purchase a new cpu!
Is it likely a broken CPU would behave in this manor?
Any other comments or advice would be greatly appreciated!!