HP Pavilion p7-1423w no longer boots

It all started on December 3, when I wanted to downgrade to Windows 7. 1st I removed my Video card which is a GTX550ti, then I disabled secure boot and then placed the card back in and can finally see the BIOS Screen with my video card in. But it would be black screen when it booted to Windows 8.
Then when I installed Windows 7, everything was fine till I installed the NVIDIA Drivers and then when Windows 7 made it pass the screen, I can hear the boot up sound but no picture on the screen.
I reinstalled Windows 8 and putted my GPU back in after turning on secure boot. Everything was fine today with the NVIDIA drivers in Windows 8 till I rebooted. Then I got black screen again (Even though this never happened before when I did the GPU upgrade 2 years ago. (Its December 5 when this happened)
Then I removed my GPU and noticed that I can see the screen again. So I tured off my PC again, inserted my GPU again and rebooted. This time after 5 seconds, I get blank screen and this time, no hard drive sounds. So I removed my GPU and when I rebooted, I don't even see the BIOS Screen anymore and my Hard Drive stops being active after 3 seconds after booting up which means my BIOS is officially fried (Can't even use Escape to access the BIOS info anymore)
Is there anything I could try or do I have to buy a new PC?

Computer Support Forums (Internet) have numerous postings from users (2012) experiencing problems with the nVidia 550Ti video card. While many of these are proprietary Nvidia driver related, a few appear to be hardware QA related (used, refurbished cards) and others related to a recent (November 2014) Windows 7/8 Interoperability Update.
The Microsoft Forum from April 2012, provided the most hopeful outcome.
http://answers.microsoft.com/en-us/windows/forum/windows_7-hardware/nvidia-geforce-550-ti-display-dr...
1. Multiple insertions and extractions of this card from your computer runs the risk of damage (physical or ESD)
to the Nvidia card or your HP computer, so let's minimize that process.
2. At this point, I would recommend these steps.
A. Remove the Nvidia 550Ti video card.
B RESET (Clear) your computer/motherboard BIOS to factory default.
C. Perform a clean install of Windows 7 (64-bit) on this computer.
D. After you have an Initial Stable 1 install of Windows 7,
THEN proceed to Check and Install ALL Hardware Drivers (HP Product Page) for your OS (watch for differences between 32-bit and 64-bit Windows 7 drivers).
E. IF a BIOS update is required or available (from HP Product page), it should be performed at this stage.
You are now at a Hardware Stable 2 position.
F. Go to Windows/Microsoft Update and TURN OFF Automatic Updates.
Download and Install all pertient Windows 7 Security and OS updates, EXCEPT the Windows 7/8 Interoperability Update(s).
G. You are now at Windows / Software Stable 1 position.
====
3. You should now have an operational and stable Windows 7 installation.
This is a good point for establishing a Windows Recovery Point, or Backup.
====
4. End of Part 1 in down shifting to Windows 7.

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