Computer won't boot keeps restarting after about 1 second

lundi4burnley

Honorable
Oct 26, 2012
9
0
10,510
I have a custom build which I made about 2 years ago and has been running fine for 2 years now no problems. I go to turn it on today and it would boot but no bios screen and very monotonous sounds inside the case as if the computer has frozen in a pre-boot state. I read through the forums and after checking all the connections, using different ram, only leaving video and hdd sata power cables in etc I decided to go out and buy a new PSU. Now when I go to turn it on it decides to shut down after 1 second before it hits BIOS and continually tries restarting by itself. I have tried removing the CMOS battery also but nothing has changed
Can someone help?

Specs:
Intel pentium G620
Intel DH67BL M-ATX board
2x4gb sticks of RAM
60GB OCZ vertex 3 drive
150GB Velociraptor secondary drive
 
To check if your CPU is working, do this -
Remove the CPU cooler.
Now switch on your PC for 5 secs.
Keep your finger on the CPU heatspread to see if ti's hot. If it isn't, you are either not powering your CPU or your CPU is dead.