My iPhone is stuck on the reboot logo while jailbreaking?

Device: iPhone 4s
Software: iOS 7.0

I was jailbreaking iOS 7 w/ evasion for my phone. The third reboot came up and after a short period of time the apple logo appeared it has stayed there for 8 hours. There's no way I can connect it to my computer because it does not read that the device is there because the device has not fully rebooted.

Should I smash the device and use its warranty? Or Do you have a simpler solution?

I have no idea how to solve your issue, but I can say that smashing the phone will not help. Damage due to the phone being dropped/smashed/crushed/etc. Is NOT covered by the warranty. If you purchased an additional insurance policy for it that includes coverage for accidental damage, then by all means, smash away. But the standard warranty, if it's even still in effect for an iPhone 4S (did you just buy it recently?), will definitely not be of any help if you destroy the phone.

Your best bet might be to just go to an Apple store and ask if they can reset it for you. They may shake their heads and say "tsk, tsk, tsk" since you tried to jailbreak it, but then they'll reset it I'm sure.

You are standing in the mid of a river with crocodiles both sides.
If you've installed the jailbreak successfully, your phone is out of warranty.
If you smash your phone, its again out of warranty.
Solution 1. If you have insurance for your phone, hide your phone for a while and report a lost of phone and then make a claim, you'll get a new one.
Sol 2. Fingers crossed, if your jailbreak was not installed successfully, visit the nearest apple store scream out loud what the **** happened and you'll take them to court.
They'll swap your phone with a new one.
Sol3. Go to any local market phone repair center, if possible to a master man who knows to fix apple phones.
Ask him to take off the battery and reinsert it again, your phone will then surely work.
But in this case you again lose your warranty.
So its your decision mate.
Take care and never jailbreak your apple when its under warranty.
Bye

Put your device onto DFU mode (plug your device into your computer and start itunes, turn off your device, hold the power button for 3 seconds, after the three seconds start holding the home button for ten seconds, after holding both for ten seconds release and itunes should say you are in recovery mode) and restore your device completely. After that is done restore your device from a backup(if you have one). If you continue to have problems, ask on jailbreakqa.com, jailbreak.reddit.com, or the evad3rs twitter accounts