When I press the start button, the lights (switch and logo)and fans are working continually, the DVD drive light flashes for 2 seconds, the LED for the system lights up for about 3-5 seconds and then fails to go any further (no flashing lights). The fans work continuously. It just doesnt go to the boot process.
After I have switched on and off many times then sometimes the system boots up and it would work. Once switched off, I have to go through the same process. When the system works, it works flawlessly without any problems whatsoever.
I have changed the bios battery, tried to update the bios but I had the latest version, removed the cables to DVD and the hard drives. removed the 2 memory sticks and tried them with various combinations. checked for viruses.
Unplug any USB externals like hard drives card readers or any other device that have internal memory storage space including USB printers with built in memory card readers try booting if it works and repeats for a few cycles try replacing them singly
In my experience ATA switch mode power supply faults usually come with a bang and a puff of acrid smoke
After the system fails to boot, the fans and the decorative lights are working but the system lights goes off (as I mentioned in the beginning of the post), My 8 year old son tells me that it works when you press Ctrt+Alt+Delete.
I tried this keeping the Delete pressed for 2-3 seconds and it does boot as it should.