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PC turns on but no video signal after upgrade

Last response: in Systems
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September 5, 2012 1:26:31 PM

Hello, friends.

I´m having a problem. I´ve built a system 5 months ago consisting of an ASUS P8H61-LE mobo, core i3-2120 processor, radeon 6850 video card and 6gb kingston value ddr3 1333 memory, PSU is an Antec HCG-520. Until yesterday 1pm everything was working perfectly.

Yesterday I got a core i5-3450 and a Radeon 7850 to upgrade my system. Got home about 8pm and installed cpu and videocard without problems. Turned on the PC, everything apparently worked fine, all fans spinning, but no video signal to the monitor. Checked all connections, reseated videocard, but no change. Thought it could be a faulty video card, then plugged my old radeon 6850 back to check. And guess what? Nothing happened, no signal to the monitor. Checked everything again, reseated processor, memory sticks, everything. No luck.

Any ideas of what may be happening? I don´t even know if it´s POSTing because it never beeps when it does normally, and i have Windows sounds off, so i don´t know if the system is loading it. System was working perfectly 8 hours before the upgrade, so i dont believe is a faulty dvi cable or things like that.

Thanks in advance!
September 5, 2012 1:43:22 PM

It the hard drive activity light on?
September 5, 2012 2:03:49 PM

It lights for a few seconds, as if loading something, and then is off.
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September 5, 2012 2:22:03 PM

a few seconds doesn't sound like it loaded the OS.

Did you update the motherboard bios before installed the i5-3450?
http://www.asus.com/Motherboards/Intel_Socket_1155/P8H6...

Try just one of the new component at a time will help determine which one is not working. And since it have Integrated video output, try that out too.
September 5, 2012 2:49:11 PM

IF YOU DIDNT HEAR A BEEP AT STARTUP 9/10 ITS THE RAM. TRY REMOVING ALL BUT ONE STICK OF RAM AND SEE IF IT BOOTS UP. LET ME KNOW
September 5, 2012 3:01:28 PM

if the computer starts with one stick of ram in, update your bios, shutdown, add rest of ram and you will be good to go
a b B Homebuilt system
September 5, 2012 3:07:16 PM

rgd1101 said:
a few seconds doesn't sound like it loaded the OS.

Did you update the motherboard bios before installed the i5-3450?
http://www.asus.com/Motherboards/Intel_Socket_1155/P8H6...

Try just one of the new component at a time will help determine which one is not working. And since it have Integrated video output, try that out too.


This was my first thought as well. That mobo will definitely need a bios update for the 3450 to work.
September 5, 2012 4:55:44 PM

wanderer11 said:
This was my first thought as well. That mobo will definitely need a bios update for the 3450 to work.


Yes, that was the problem. I had not updated the BIOS before the new processor. Had to remove it, reinstall the i3-2120 and it POSTed normally. Then I updated the bios, reinstalled the i5 and now everything works fine.

Thanks for the help, guys, really appreciate it!
!