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If there is no power light and it can't charge your laptop, it is likely that the charger is dead. You need a new laptop charger. So try a new adapter to confirm the real issue.
There are two kinds of ac adapters for your toshiba l305-s5955
You should choose the right charger depending on your original adapter's specification. If the original one need 90w, you won't buy 75w that will bring damage to your laptop. If it needs 75w you can use 90w too.
Try moving the arc mouse USB dongle to another USB port on your Toshiba Satellite L650. If the mouse works on the other port, then the first port is the problem. Use Control Panel's Device Manager to further diagnose the port problem.
Probable inverter board failure; this supplies high voltage to the fluorescent back light(s).
You can see what they look like here:
eBay-Toshiba inverter boards
The first characters of your model number - L305, are the most important, the others detail items such as CPU, hard drive, etc.
It wouldn't hurt to be honest about what happened with the service plan provider and see what they say. It would be a shame to have to replace your computer over a broken USB port. You can always purchase a USB hub which plugs into one USB port and supplies you with two or more USB ports.
There are a few toys and devices made in China that deadshort the USB terminals. I hope you have not bought and installed one of these. I had 2 in the shop a year ago with some Dora Explorer usb toy that toasted the usb once installed. If you have bought and installed something about the same time as the usb stopped working you will need to call the company that made the device and demand they replace your motherboard.
I have a Toshiba Satellite laptop and experience this problem with the mike stopping suddenly too. Your solution may not be as easy as mine was, but here goes ... Did you check the audio setup? Go to Audio Properties, and click Advanced so you can see the Microphone properties. Mine was muted and it wasn't me that muted it -- just seemed to happen suddenly and hopefully it's that easy for you!!!!
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