I have an hp proliant DL360 G6 server that was 1 year stopped.. I turned it on last week and it was working just fine. So i left it working during the weekend. On Monday when i returned i notice that it was on suspension mode. I tried to bring it back to life but no results. So i turned it off by pressing the button, when i turned it on again it wont boot and no post. I only gives me a long beep continuosly. I have changed the memorys, processor and fans are runing fine. The internal leds on MB are all green but i have a blinking green led next to the memory slots 1. On front the power button led is green but the health led is blinking red. Note: I have changed the hard disks when i turned it on the first time one year and it was working perfectly fine.
Please examine the ILO log and the IML log. The server will tell you exactly what's wrong.
But really, I wonder if you may have caused another issue while swapping components looking for a solution. If you're seeing an error on a particular DIMM slot, there may actually be a problem with the CPU socket for the processor associated with that memory bank.
Inspect the LGA socket for bent pins.
You can also just call HP directly for help.