Computer powers on but screen is blank

[Dhevesh]

hi i have an xfx g31 motherboard with an intel core 2 quad processor,4gigs of ram 500gb sata HDD, grafix ati radeon HD5770 1gig and a 500watt superchannel(power supply make) powersupply.My computer kept restarting after about 2 hours..On sunday i turned it on and it restarted and now it powers on but the screen is blank..all fans are working.I tried a new motherboard,i tried a new cpu,i tried a new powersupply nothing works.I took my ram sticks out and there was beeping sound.i took my battery out to reset the bios.i changed my battery and it booted up.but after i shutdown..it went back to the same problem the screen is still blank.any suggestions?what could be wrong?

 

[Dhevesh]

Problem Solved

Hi, i have solved the problem with my computer.I discovered that it was indeed the motherboard that was faulty.Even though i tried some of the suggested methods of troubleshooting,they were ineffective.I heard beeps when i took out my ram from my computer,so i guess that method of determining the motherboard is fine is not always right.Yes i now have a newer and better motherboard.
Thanks to all.