um, I think I fried my Arduino uno because the tx and RX lights are on and the uno does not power on when I connect it to my Chromebook. I hope it is not broken because I am ordering a Arduino nano to burn the bootloader to it. (i smelt smoke)
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UPDATE
I tried another usb cable and it did not work
What were you doing with it just before that ?
I was connecting fans to the vin port (ac to dc converter) and I think the wires touched and I think the USB serial controller bombed out or I courpted a piece of firmware
It obviously is broken 
Try to power it using a cellphone charger; if that does not power it on, I suggest that you replace it (or use the Nano).
it did work when it was connected to a cellphone charger and my big laptop
I got it for Christmas and my mum will be angry if it irreparable. 
I was a bit confused, sorry. It does not power on (you said) but rx/tx leds are on. So it must be powered on.
Is the board detected in the IDE? If not the TTL-to-USB is damaged.
If the board does NOT use the CH340 TTL-to-USB converter and it's detected in the IDE, you can run the loopback test; Loop-Back Test Instructions. If that fails, either the TTL-to-USB convertet is damaged or the 328P.
Does your Uno have the DIL 328P that you can replace? If so and your conclusion is that the 328P is damaged, you can buy a new one; life will be easier if you buy one with optiboot (the bootloader) preloaded
I have no experience with chromebooks so probably can't help further.
Yeah, that happens.
Tell your mum that you learned to turn the power off before changing things. That is a big one and almost every day somebody has a problem because they did that. The UNO is not that expensive, cost is less than a meal out.
well it does power on but the tx/rx lights stay on and it does not run the sketch on there
um can i still upload sketches to it using the iscp port on it
Please try what I suggested and report the results.
If the 328P is not damaged, you can upload using ICSP. If that fails (or if burning the bootloader fails), you know that the 328P is damaged.
Hi @sterretje here are the test results
Ans1: In the Arduino editor there are two serial ports. one was COM4 and one was COM5. I tried both to get the board info (i think that is how u detect the board) but it did not work (COM4 & COM5 also did not disappear from the editor when unplugged)
when i open COM5 serial port it gives me this msg:
Ans 2: No, the loopback test did not work (given the img above)(COM4 just gives blank)
Ans 3: Yes my Uno has ATMEGA328P i can replace and only $8 at my electronics store
just to check is this the right microcontroler? (also comes with optiboot)
Wrong chip in the Jaycar link; you need a 328P, not a 32-8P. This one has too many pins and will not fit in the socket unless you create some form of adapter board.
If COM4 and COM5 don't disappear when you disconnect the board, they are not you Uno.
if he burn 328p his arduino compeletely disappear from existance
it gives that broken string because you are on wrong baud rate try 115200
That one will work; you don't need the crystal as there is one (probably a ceramic resonator) on the board.
Note that the TX/RX are driven by the TTL-to-USB converter so that one might be toast.
Maybe you burned usb on your chrome book instead