Sir lei, try mo po remove yung 4-pin na power near sa processor mo, then try mo switch on... kapag nag-on, kulang ang power source, kung hindi po try to re-seat memory, hdd sata cables, and processor. Check mo po ung heatsink ng processor kung marumi, if ever use brush to remove dirt. Last resort mo sir, remove mo po lahat sa case, tapos connect everything, baka my nag-shoshort lang po..