Gothch1ck,
I've re-read all your post carefully and wanted to assure you that
your symptoms are "Exactly" what happens if you have the monitor plugged into a PCI graphics adapter and change the CMOS setting to AGP!!!
Your PC will boot with no BIOS beep codes, the fans will operate, the hard drive activity light will activate and the monitor will display that it is working / check your cable! But you will not have any PC output to the monitor.
If the CMOS Graphics setting was changed inadvertently -
You have to remove the Monitor cable from the PCI card and plug it into the graphics port on the Mother board.
Whether or not you physically remove the PCI graphics card "shouldn't matter," but I remove it - just to make sure there aren't any hardware conflicts to complicate the recovery effort. Then I boot into windows, remove the driver(s) and software that was installed by the PCI card installation. Then enable(or reinstall if necessary) the Intel onboard driver and update it. reboot windows and make all necessary adjustments to the video, such as "proper" resolution and refresh rate.
If the PCI card is preferred then go through the installation properly.
1) Disable Intel driver
2) Reboot and let Windows adjust to default "VGA" driver
3) Install Driver(s) for the PCI card
4) Reboot PC into the CMOS setup
5) Change the CMOS graphics from AGP to PCI
6) Save settings and shut down PC
7) Install PCI graphics card
8) Disconnect monitor cable from Onboard port
9) Connect Monitor cable to PCI Graphics card
10) Power up PC and boot into Windows
11) Follow any Windows prompts to finish the PCI installation.
12) Make sure to adjust monitor Resolution and refresh settings to proper.
ALSO:
MAKE SURE THE VOLTAGE SWITCH ON POWER SUPPLY WASN'T (accidentally) SWITCHED FROM 110 to 220
My co-worker has a PC from Wal-Mart "E-machine" the only thing hes done is add a GPU to it, and it worked for months, but recently.. it's decided to stop.
When attempting to troubleshoot it, it won't boot. The fans kick on, full speed, but nothing changes. Messing with it some I managed to luck it out and get a boot, but it freezes up during any activity.
Turning the power off via-button is troublesome , most the time it just restarts itself to black screen repeatedly.
Any suggestions? (besides scrapping it)
Costs of repairs would need to be minimal. He's got a baby on the way and no money for "electronic fun".
I could only think of possible:
Mobo
Harddrive
Power Supply
But Have never had this issue so I really don't know how to fix it for em.