The radio in my 2007 Honda Accord stopped working. This is not the first time it stopped, it corrected itself over time and went back out again. The radio won't even come on, no lights, no nothing

ive posted this 12 times now (searches do work)
short answer, drive to honda dealer,
long it the guide,,,
here is lucky 13.
De'ja' vu , all over again. (LOL) RTM
RTM read the operators manual, its all there, here is a direct quote.

quote 13
2008 opr.guide.(lost it, huh?) Accord. non satellite Rad

Quotes:
Your vehicle's audio system may disable itself if it is disconnected from electrical power for any reason.
To make it work again, you must enter a specific five-digit code with the preset buttons.
Because there are hundreds of number combinations possible from the five
digits, making the system work without knowing the exact code is nearly impossible.

You should have received a radio code card that lists your audio system's code and serial numbers. {glove box find}
It is best to store this card in a safe place at home. In addition, you should write the audio system's serial number in this owner's manual.

If you lose the card, you must obtain the code number from your dealer.
To do this, you will need the audio system's serial number.

If your vehicle's battery is disconnected or goes dead, or the radio
fuse is removed, the audio system will disable itself. If this happens,
you will see ''ENTER CODE'' in the frequency display (on the screen on models with navigation system) the next time you turn on the system.
Use the preset buttons to enter the five-digit code. The code is on the radio code card included in your owner's manual kit.
When it is entered correctly, the radio will start playing.

If you make a mistake entering the code, do not start over; complete the
five-digit sequence, then enter the correct code. You have 10 tries to enter the correct code.
If you are unsuccessful in 10 attempts, you
must then leave the system on for 1 hour before trying again.

The system will retain your AM and FM presets even if power is disconnected. {only on newer cars'

General information on Honda and DIY:

{the code can be obtained from any Honda dealership (you must give him/her your radio serial number (sticker off radio)"}
or any locksmith with a license from..NASTIF

Honda1 ServiceExpress (Same info as ISIS)

Acura ISIS (Dealer version w/ advanced search)

http://nastf.org/i4a/pages/index.cfm?pageid=3462

if you didnt set the code your kinda screwed. it's a anti-theft idea once battery is disconnected (dead) or radio removed, you have to renter the correct code to work radio.

Probably not a speaker issue. Most likely it is in the radio itself. I have found several helpful hints on-line so try to google this before going and paying anyone to do it for you.

Check fuse 9 15amp ,this controls ciglighter/radio
Fuse box located glovebox area,check owner manual for location

when battery dies the radio deems this to be that someone is trying to steal it and it goes into anti-theft mode and disables itself u need to notify a dealer the codes are dealer issued because they are considered a part of the vehicles security system call the dealer first will explain how to retrieve the radio id number which is needed

Your car’s audio system will disable itself if it is disconnected from electrical power for any reason. To make it work again, you must enter a specific five-digit code in the Preset buttons. Because there are hundreds of number combinations possible from five digits, making the system work without knowing the exact code is nearly impossible.
You should have received a card with your manual (if you have one) that lists your audio system’s code number and serial number. If you don't have the card, you can get the code number from your Honda dealer, but to do this, you will need the system’s serial number.
If your car’s battery is disconnected or goes dead, or the radio fuse is removed, the audio system will disable itself. If this happens, you will see ‘‘Code’’ in the frequency display the next time you turn on the system. Use the Preset buttons to enter the five-digit code. If it is entered correctly, the radio will start playing.
Hope this is helpful.

Mine went out as well, it's the Radio itself. Need to replace it or fix it. I got mine fixed at Honda dealership, Radio supplied by Honda, and I paid $99 for labor.

Have you checked the fuses in both fuse boxes?

Check owners manual, made written on inside of covers or on radio pages.  IF not check inside of glovebox for four digit code.  If not luck, remove radio document all number, ie serial number on unit and call local honda dealer.  They must run the VIN and radio info back to the motherland to get lock code.

i need the radio code for my honda accord