can u list your specs? like what cpu u have? did u do any upgrades?
ALSO, i have found that RAM could be an issue aswell, when RAM dies your computer could power up for an instant and turn off again. Among other random screwey things. I build computers constantly and for a power issue like that its norm 1 of 3 things
an upgraded piece that your powersupply isnt sufficiant wattage now
dead motherboard (which u can buy one for 45-300 dollars depending on what you are wanting to do with it)
or RAM issues
also check n see if your wires on the JSP1 part of your mobo havent been loosened up
The specs are here. No upgrades.
If it was the RAM it would turn on for a second? I mentioned it does nothing, so it isn't that.
I have no idea what a JSP1 part is, and I didn't see anything labeled so. Everything is plugged in well though.