Why isn't my Dedicated Graphics card being utilized?

I have a Lenovo G510 with Intel Core i7-4702MQ @ 2.20GHz, 8GB DDR3 Ram, and Intel Integrated graphics 4600 with 2gb vram as well as an AMD Radeon HD 8600/8700 chipset with 2gb vram as well. I think my AMD is an AMD Radeon HD 8750m to be exact. I went on amd catalyst control center and set the graphics settings of just cause 2 to high performance and when I ran the benchmark on Just Cause 2 it gave me an average fps of 28 and it told me that it used Intel Integrated Graphics 4600… Why can't I get my amd card to work?!

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How to get my phone to connect to my PC?

I have an Android Z992 and a Lenovo that runs Windows 8. I used to be able to bluetooth pictures to and from either, and I could access my file on my phone through the charger cable, but now I can do neither. There's no alert when I try to bluetooth stuff. It just says transfer failed. When I try to access the files through the cord it says it can't access remote bluetooth files and that the device may be off, even if it's not. Is there a way to fix this?

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Is this good for gaming? Mostly COD, Battlefield, Etc. (Mid settings)?

I have a Lenovo G580 (Discontinued) with an Intel core i5-3219M @2.50Ghz (Overclocked with Intel Extreme Tuning Utility) [3.1Ghz?] and 6GB of RAM. I'm even using a 16GB pendrive as Readyboost and have 133GB free of 195GB. I also changed the battery settings to maximum performance and even use Razer Cortex. Will this be enough for COD? (Med settings)Is this good for gaming Mostly COD, Battlefield, Etc. Mid settings

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Windows 8.1 black screen after logo?

So i finally got Windows 8.1 but when i installed it on my PC it booted up for the first time and next time i turned it on the windows logo appeared but after that there was just a black screen. Have reinstalled it serval times, the same thing keeps happening

My specs:
MB: gigabyte ga-b75m-d3v running UEFI dualBIOS version f5
500w PSU
8 gigs of ram
PCIe wireless card
ASUS gtx760
HDD: WD5000aakx
CPU Intel 3550k (i think)

i don't know if it makes any difference, but in order for me to access my BIOS i have to plug the DVI cable directly into the motherboard and therefore take my Graphics card out. So the installment process is w/o the graphics card. And i'm installing via a USB

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Macbook Air or Lenovo Yoga 2 Pro?

I'm a college student (engineering major).

Macbook Air 11", i5, 128gb ssd, 4 gb ram: $800+

Lenovo Yoga 2 Pro 13.9", i7, 256gb ssd, 8gb ram: $1100+

Lenevo Yoga 2 Pro11" i5, 128gb ssd, 4gb ram: $700+

Which is better option?

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