Hi,
I recently replaced several things in my three year old computer. I replaced the motherboard, memory, CPU, and graphics card. I kept all other parts like the computer case, power supply, hard drive, and DVD/CD drive. After removing those four parts and installing the new ones I connected everything back up and went to turn on my computer but there was no power, except for a blue light that turned on inside the case for a split second (it looked like the CPU Fan).
I used my computer with the old parts today so I know everything like the PSU and such was working before I installed the new stuff.
My computer specs are:
Motherbord: P67X-UD3-B3
CPU: Intel i5 2500k
Memory: Mushkin Enhanced Blackline 4GB (2 x 2GB) DDR3 1600 (PC3 12800)
Graphics card: Geforce 570
PSU: 750W PC Power and Cooling