Hi Guys

I want to use my home PC for web hosting.

What are the features of a PC used for Web Hosting in terms of, HHD size, RAM, processor, etc.

Bandwidth issues, ADSL speed, etc.

Regards

first
Is there a contract clause that FORBIDS you to run a server on your HOME cable connection
For example
Comcast forbids you from doing this on a HOME cable
you HAVE to buy a business service

on a dsl connection
i would not try unless you are only going to have text on a small blog for say 12 people

you really do want a 10 meg up and 10 meg down min. connection

To add a little more color to that answer:
In my area COMCAST took over from AT&T AT HOME, and my 'grandfathered' contract did not have that clause. I ran a server at home, though only for my own use. I stopped when they changed the contract. (Is it really a contract if one party has no choice but "take it or leave it"?)

Professionally I sometimes scale servers using test analysis, but what I found at home was that it was a moot question. The ISP is not going to give you enough inbound bandwidth for load levels to overstress even a pretty minimal machine. Just keep your installation light.

Speaking of light: Puppy, Minicore, Tinycore, or DSL should work, though the last two are built to support desktops - which is totally a waste on a web server. If you feel the need for LOTS and LOTS of server options, a pretty minimal Debian install might serve as well. On a minimal machine I prefer Lighttpd or xitami over apache. Apache has the power curve, but also lots of bloat. Even a server like Monkey will do well enough for a small home server, without driving you crazy with a million settings.

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IF you decide not to reload your current PC, check first to see how stressed it is now. You should not need very much more resource, but if your memory is maxed and you are burning swap, your CPU is running hot and wait times climb during normal operation, you disk is 85% full already, perhaps you should think about doing some housecleaning and preparation first.

No, it's a license.

I self-hosted on Comcast for several years. At the time, the license said "no hosting service." I was prepared to argue that I was not providing webhosting as a service.

My current ISP says, "No servers." That's one reason I now use a hosting service (plus my MySQL database outgrew the capabilities of my P4).

Back to the original post: You need a computer running the LAMP stack and a dynamic DNS service such as no-ip.com (that's who I used and they were rock-solid stable). And that's it.

Some very weak systems can support a web server. It kind of depends on the amount of data. For a typical home type system, almost any made in the last 15 years should do if all you need is your family to see some data and photos. There are some really basic devices running a web server. Some home nas have web servers on them and even some plugin servers that are as small as two packs of cards.

So, if you tell us more about the content you need to display and the amount of data we could make a better guess.

One might get past some of the isp restrictions by using a different than port 80 port. I don't know your isp eula or agreement.