Unable to connect to PC & unable to switch on wi-fi

I have what appears to be two faults with my device.
When I conect via USB to my PC and run BB Desktop Manager, I have the manager desktop app start up; this has the PIN for my device but says 'Disconnected' I have tried
Options > Connection Options > Connection type USB from the drop-down menu but no connection. Everything else in that set-up screen box is 'greyed out'
Also, if i go to
Manage Connections and tick the wi-fi box, after approximately 5 seconds, it just 'unticks' and will not switch on at all.
Any ideas? Or is it merely faulty?

Hi and Welcome to the Forums!
Here is the list of USB troubleshooting articles...hopefully something will be useful:
http://supportforums.blackberry.com/t5/BlackBerry-Desktop-Software/Tips-for-getting-BlackBerry-Deskt...
KB02640 Troubleshooting USB connections
KB15486 Top 10 BlackBerry smartphone and BlackBerry Desktop Manager troubleshooting tips
KB11439 BlackBerry Desktop Software does not detect the BlackBerry smartphone when it is connected
KB00019 No PIN displayed in BlackBerry Desktop Redirector
KB10938 "USB charging current is insufficient" appears on the BlackBerry smartphone
KB01451 How to turn on advanced synchronization logging if a wired synchronization fails
KB19717 The BlackBerry smartphone is not detected as a USB Mass Storage Device when connected to a computer
Also, check that you are using only root USB ports...no hubs (sometimes the front-side ports are hubs...use a rear USB port). And make sure to try disabling USB power management in your system configuration (Device Manager).
Apologies in advance if this is redundant -- there's no way to be sure if you've already seen and tried these.
Also, anytime random strange behavior or sluggishness creeps in, the first thing to do is a battery pop reboot. With power ON, remove the back cover and pull out the battery. Wait about a minute then replace the battery and cover. Power up and wait patiently through the long reboot -- ~5 minutes. See if things have returned to good operation. Like all computing devices, BB's suffer from memory leaks and such...with a hard reboot being the best cure.
Best!
Hopefully something there is helpful!
Cheers!
Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.
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Message was edited by: lupunus (typo's fixed)

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I tried being the most descriptive I could

I am only able to connect to the internet on my main computer.
What IP does your main computer get.. ?? Post a screenshot if you can as it helps to see the details.
When you open the airport utility on the main computer.. click on the TC what errors does it show?
They will list in the summary.
What mode is the TC in? If the setup went wrong it might be bridged when it should be in router mode..
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The most recent TC can still have issues.. new AC version TC and AE have the Max amount of issues with SB6121 and 6141.. there seems to be some ethernet issue between them..
What model TC do you have??
You can slow the LAN port down or specify the actual speed in the Gen1-4.

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Clear the cache and the cookies from sites that cause problems.
"Clear the Cache":
*Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
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*Do NOT click the Reset button on the Safe mode start window or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
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