Okay, your laptop is dead. That's frustrating. You've tried everything, but it's time to give up. You're then faced with getting rid of your laptop. You have several options at hand.
The batteries and circuit board of your laptop are made out of metals that need to be disposed of properly. Failure to do so is illegal in most industrialized nations, and in many states of the United States. Although not rigorously enforced, it is important to dispose your laptop safely for the sake of the environment.
One way to get rid of your non-functioning laptop is to sell it to a disposal service. While many of these services are technically legit, be aware that they will be selling your usage data to advertisers later on. For example, Cash4Laptops will purchase your broken laptop for $100 to $300, depending on what you send in. They pay this much not just for component parts, but also for the data on your browsing history and installed programs. If you do not want them to have access to your files, you will need to delete them first. Of course, to delete them, you'll need to be able to boot up the hard drive, which might not be possible with your broken laptop. One alternative is to open up your case and physically remove the hard drive, though this will likely cause the price you receive to be far less than it otherwise would be.
You can also donate your used laptop to a needy organization. Do not assume that they will want the donation; check first to ensure they have the capability to deal with a donation of a broken laptop. If you do not want them to have access to your data, be sure to either delete the data or physically remove the hard drive from your computer before donating. After donating, you may be able to get a tax break for the good deed.
It should be noted that if you decide to sell or donate your computer and only deleted the data from your hard drive first, they may be able to recover that data later on. It is certainly not cost efficient for them to do so; recovering deleted data is a nontrivial procedure. Yet, it is definitely possible. If you have data on your hard drive that must be kept private at all costs, but do not want to destroy the hard drive, you will need to reformat the drive, fill the drive with random data, then reformat the drive again. Assuming you reformat twice and use genuinely random data to fill it to capacity, it will no longer be possible to read old data on the drive, yet will still be usable later on. A single reformat can be undone, though only with extreme expertise. If you decide to just trash the laptop, be sure to dispose of your laptop battery safely. Most electronics stores are required to have a free laptop battery disposal service available for public use. The circuit board will also need to be disposed of safely; the store will be able to take it as well. Because you're throwing away the rest of it anyway, you may as well enjoy yourself while taking the circuit board out: try taking a sledgehammer to your computer just to see how it feels. The circuit board will be easily accessible after a few good smashes. Everything other than the batteries and circuit board can be recycled or trashed with little concern.