While you did change/swap parts it appears the bios was probably setup to "reboot on error" in it initial working state. This alone makes it frustrating to resolve the problem. I suggest you find the CMOS/bios clearing pins and use them to reset the bios. Then, reboot and check results. You mention no ram installed in your post as minimum configuration, well you do need ram present in order get beyond that error. Please explain fully what got you to this point. If you can, try to enter the bios setting area if the display becomes active and allows this. Are there any beeps? Do the LEDs represent any possible clue as to condition of system, do they blink or display a status??? review manual or visit support website. Because, all that's left is the mtrbd., it could well be the primary fault, replace.
The problem is that when I try start up with minimum configuration: cpu, motherboard and power and case of course. The power fan and cpu fan just run 1 second then down 2 second and then run again and down again. I think the normal situation should be the fans keep running and the motherboard alert no memory found.
there are 4 phase leds on board, two green down one yellow up and one yellow top.
I have replace the power and cpu, it doesn't work. Now I am gonna change the motherboard. But before that, I post to see if there are some good solutions. And I wonder if there is a chance that it the case problem.
cpu : i5-760
motherboard : gigabyte p55-usb3
power : corsair TX 650w power supply