"Pc doesn't work correctly after changing bios"

[sjmlls]

Hi!............
Few weeks ago I set a graphic card for my desktop-nvidia gt7300 ddr2 256mb-after that when I restart the pc I heard a beep sound and it say something like "error......................Press enter to setup or Esc to start normally".Then I enter to the bios and changed some items<I can't remind that> after that I save the settings and restart the pc.Then desktop doesn't boot;can't access to the logon screen;can't access to the bios setup.
Now, when I turn on the pc,it display that "system is starting-to interrupt normal start, press enter"..........Then I let it start normally,but doesn't happen anything.Then I restart it again and press enter.but didn't happen anything.Then I press F1 to enter setup.But i can't access to the setup.I reset the jumper,remove the battery,but didn't happen anything.
I'm afraid that my motherboard has damaged or fried.
if you can help me I'm very thankful.
My cpu is Lenovo Thinkcenter.But I can't find the motherboard model or cpu model number...When desktop turn on it says something about "phoenix".is that the model?.............

 

[lonewolf7]

Phoenix is the BIOS vendor.

Remove the GPU and try to start the PC, see what happens.

Download and install this program, then run it to know your system configuration : http://www.filehippo.com/download_speccy/

I don't think your MB has damaged, to make sure, take out all the RAM sticks, and start the PC, and listen for beeps, if it beeps then its ok, if doesn't then its dead.

Here is Phoenix BIOS beep codes : http://www.bioscentral.com/beepcodes/phoenixbeep.htm#

And try to take out the CMOS battery again for 15 mins. then put it back, see what happens.