Why does my desktop PC fail to boot first try?

After having since installed Windows 10 Technical Preview on a 80GB HDD, single partition, as a main OS (NOT DUAL BOOT).
whenever I start up my desktop PC for the first time it automatically turns off just before I am able to login to Windows 10 Technical Preview.
When I turn on my desktop PC a second time Windows 10 Technical Preview starts up fine.
I tested this a few times in succession and every time I shut down my computer and then turn it on, loading Windows 10 Technical Preview, it loads the preview successfully.  However after leaving my computer off for a period of at least 30 minutes and
then turning it back on, the first boot causes my desktop PC to automatically turn off before I'm able to login.
I would like to continue using the Windows 10 Technical Preview but if I'm unable to successfully boot up the first time, every time, it's frustrating.
My Desktop PC System Specifications:
CPU: Intel Core i5-750 Lynnfield Quad-Core
MB:   ASUS P7P55D - Hybrid Series
RAM: Corsair XMS3 4GB DDR3 1600
HDD: Seagate 80GB 7200 RPM
GPU: SAPPHIRE HD 7750 1GB GDDR5
PSU: Antec CP-850

Sam_Prince,
Do you have any unnecessary devices such as USB drives connected? 
If you installed Windows 10 Technical Preview from a USB drive and left it connected, that could be the cause of the issue if it is malfunctioning. 
Try disconnecting any unnecessary peripherals when you boot. 
If that solves the issue, connect them back one by one until you find out which one is causing problems.
Another possible cause could be your memory. 
If it isn’t seated properly into the motherboard, that would cause problems. 
You can also try running the Windows Memory Diagnostic tool. 
From the Start button, type memory into the search field and select
Diagnose your computer’s memory problems.  Then select Restart now and check for problems.
Hope this helps!
Mike
Windows Outreach Team – IT Pro
Windows for IT Pros on TechNet

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