Dead iPad

In such a situation, your iPad battery might be faulty. Follow all the steps provided in this support article:--> If your iPad won't charge - Apple Support

If the issue persists, contact Apple Support directly, using this link:--> Get Support , or make an appointment and have your device inspected at an Apple Store or AASP (Apple Authorized Service Provider) among this list:--> Apple – Location Selector

After checking it out, they'll give youall the available options.

Regards

Giulio

If it hasn't been charged at all for more than 6 months, the battery may have failed. Having a computer would not help.

Leave it plugged in to charge for several hours and see if anything happens. If not, click on Get Support to contact Apple for help.

~Lyssa

I would leave it on the charger for, at least, 12 hours, or so.

See if your iPad comes back to life.

Best of Luck to You!