No boot It all started 8 days ago. I was browsing internet and I got a blue screen and computer went off. Now everytime I turn it on there is no display on the screen(light stays amber), all the fans are working fine, the power light on the tower remains on and the CD drives comes on startup. There are no beeps at all What I have done so far: 1. Power cycled the tower several times. 2. Redone the cabling on the motherboard. 3. Reinstalled the RAM (I have two 4 GB DDR3 sticks). 4. Replaced the motherboard battery. 5. Cleaned the tower and all the heatsinks inside the tower with air blower. More details: a) The computer is dual boot with ubuntu. b) Computer would boot up occasionally but won't load the os. For Windows 8 it shows up error about missing ntoskrnl file. For ubuntu there is no error message but just a black screen. c) Lately I discovered that the computer would boot up to the above condition in the morning or if have not tried to turn it on for a oong time. d) after 3-4 tries of step B it goes back to the original problem state. e) Today 7 decided to boot it with an ubuntu live cd to see if it works but it does not and stays on the black screen. e) The computer is around two and a half years old. I guess there 7s some problem with either motherboard or the SMPS. waiting for teh suggestion.