I apologize for my english,
hp 3500 pro does not start does not fit even in the bios but the fans are started every 5 seconds continuously. I changed my power supply, RAM, put the thermal paste, run diagnostic tests using HP tool with no errors, I formatted the drive but the problem remains.
A strange thing to point out when I perform a reset CMOS battery or take off for 5 minutes, or I remove the ram module and resubmit the other slot PC starts without errors and within very well in windows 7 32-bit, error-free, if I turn off the PC will have again the problems described above.
PC motherboard H-CUPERTINO2-H61 microATX BIOS version 2013 Revision HP
thanks for yours help