There are many types available to accomplish this task. Generally, you get what you pay for when it comes to computer peripherals. So I try and pay a bit more for them knowing they can be transferred to another newer computer in the future when I upgrade, Laptop computers/pads usually have webcams built in to them already. If you have a desktop computer, make sure you have an available USB port. What you want is something that has reasonable resolution for things like SKYPE and other video chat programs. I tend to get the ones rated at 1080p (high resolution) for this. Remember - the ability to use this is also tied to how fast your internet connection is, slow connections mean you need to turn down the X/Y resolution of the camera so it will update reasonably without a lot of jittery movement. I like the Logitech - HD Webcam C615 - it's on sale for $46 bucks I believe. It's a decent webcam, and I get a little expensive, but a good investment for a quality product. This has 8 megapixel still pictures and a 30 frames per second chat - so it is decent. If your line is slower you can always change the resolution of the camera to match the slower speeds. It also comes with some utilities for face tracking and putting pictures in place of your face, with moving mouths and eyes on them - I know, a little creepy. It has auto light level as well. In the end, if you are doing video interviews or preparing videos to publish - this is not a bad one to use. Worse comes to worse, if it does not have a high enough resolution (which I doubt), take it back and get a higher end one.

There are several options for this. I personally like the NETGEAR - DST Wireless Adapter, or a similar product. It essentially allows you to plug in an Ethernet 10/100/1000 cable and it send the data through the electrical wires in your house to another receiving unit which is then plugged into you computer/other. It does not have the same problems with wireless connections where the speed is constantly being downgraded because of bandwidth and other interference in the air. I find they are quite acceptable for streaming movies also. This works well if you are in a home vs. a business - since the second might have more interference on the wiring in the building. I do not recommend for say an office that has an attached manufacturing facility that might have large machines around. Make sure that the standards for the item match your device, i.e. IEEE 802.3 protocols - should be right on the product on what it supports.

There are converters that will allow you to connect HDMI output (I believe that is what you were asking) to an analog TV. Do a search for "How I Connect HDMI to Old/Analog TV" on Google for your options. Please be aware that connecting to an older TV is not a good use of your dollars. You are better to buy a monitor or TV that excepts the HDMI input signal. The reason is because the older TV's do not have the resolution required to get a clean picture, normally those devices are restricted to 800x600 maximum or lower. I would spend the money towards a new TV or monitor, instead of a conversion box, you will be happier - check the sales here on Best Buy, they are not bad and have decent support for them, and no - I don't get money for recommending them.

I could not find a replacement for this in the Best Buy system, however, the item you are looking for is a DC 19V ASUS Power Supply, and can be had through most computer electronic power supply houses. A search using google with "ASUS Q551LN-BSI708 adapter" will reveal multiple choices and vendors. You should use an appropriate replacement of equal wattage (90 watts in your case) for a replacement. Make sure the picture represented has the same type of end connector on it. Hope that helps.