Windows 8.1 freezes at boot screen

Hi,
Today morning when i tried to switch on my PC, it hangs on the Win 8 boot screen. At times it would give me the BSOD ofMachine_Check_Exception while hung at boot. At times it tries to do an Automatic repair as well, but freezes again on the boot screen itself with it below saying "Preparing Automatic Repair"
I also see an error PCI IRQ Routing Table Error - 07 1F 00 just before boot.
I would have to restart like 10-20 times or maybe more for it to get through to windows. I thought it was a windows issue so i tried to boot into my Win 8 and Win 7 USB's so i could format and reinstall but it Doesnt let me Boot into the USB after i select the option to do so. It would take my straight to my current Win 8 install Boot screen and hang there.
Since a few days now, my system would not shut down when i would click on shut down. The screen would go off and all but my Desktop cabinet would still be on. It used to restart fine when required but that doesnt work now too. I have to switch off the mains to get it to shut down so i can restart.
The red LED's on my mobo dont stop at the CPU, RAM, Video card and forgot whats the last one for. So is this a windows issue? A hardware issue? and how do i fix this?
I havent made any hardware changes to the system. Ive tried to boot with just the monitor plugged in to the system and same issue.
I have reset my BIOS. I cant get into safe mode or boot from USB.

Hi,
Please post the HP product number for your PC. How to Find the HP Model Number and the HP Product Number or let HP automatically find your PC model number and HP network attached printers. This will allow others to review your issue, make suggestions and review your responses. This is usually the best way to get assistance.
HP DV9700, t9300, Nvidia 8600, 4GB, Crucial C300 128GB SSD
HP Photosmart Premium C309G, HP Photosmart 6520
HP Touchpad, HP Chromebook 11
Custom i7-4770k,Z-87, 8GB, Vertex 3 SSD, Samsung EVO SSD, Corsair HX650,GTX 760
Custom i7-4790k,Z-97, 16GB, Vertex 3 SSD, Plextor M.2 SSD, Samsung EVO SSD, Corsair HX650, GTX 660TI
Windows 7/8 UEFI/Legacy mode, MBR/GPT

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drenched wrote:
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Empty,Blue Screen.
http://docs.info.apple.com/article.html?artnum=106464
1. Start up in Safe Mode.(shift key at startup)
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I would like to change "Windows" to "Windows HD" on boot screen (option key). How can I do that?
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+Total Number Of Cores: 4+
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