As a service provider, I went to attend to a fault for 'Non-Booting' of the system. After the routine check, I concluded on the following:
(1) Faulty Rams - I tried the normal procedure of cleaning the contact terminals of the RAM sticks and yet the system
would not boot.
(2) The fault could also be in the system hard disk.
Note: there was a burning smell emanating from the inside of the system - But could not identify the reason - Is it to do with the SMPS??? If that be so -
The power supply to the peripherals seemed to be o.k and all the peripherals working normally - the C.P.U fan and system cooling fan were running o.k
Did you test the boot with each stick of RAM individually? You could just have bad RAM. Beyond that it's hard to say without more info. If it's a problem in the hard disk or the MB that'll be harder to check than RAM.
Jus reset it... it will not hurt your computer and it is a way of trouble shooting so, if you really don't want to try and trouble shoot then don't do it but if you want to at least try then go ahead...