No start button

It's 3 weeks old have it replaced.

This is the way to reset the Action Replay for DSi.
1. With the DSi powered off, hold A and B together.
2. Turn on the DSi, still holding A and B.
3. As soon as the Nintendo screen is displayed, before the screen from Action Replay stating that the product is not endorsed by Nintendo, press and hold the Start and Select buttons together while still holding A and B.
4. Continue holding them until the main Action Replay screen shows up.
You should now have reset your Action Replay DSi.
Hope this helps!

look friend YOU WIIIILLLLLLLL NEEd to hack it in order to apply the cheatcodes BUT hers on more good thing I have done this a long time ago NOw reply to me if you want to know how to hack it AND to apply the cheatcodes WIThout the action replay SEE today we dont need the actionreplay or gameshark REPLy to me if you want all this!! NOTE you will not be possible TO hack a psp thats a 3000 check by the information bar on the bottom of your psp there are serial numbers than it goes to psp and it tells you what current type so if its 1001 or 2001 it will work BUT IT will not work for 3001 or 3000 REPLY friend

1/ With the console powered off, hold A+B.
2/ Power up the console while still holding A+B.
3/ As soon as the Nintendo screen is displayed, before our screen stating this product is not endorsed by Nintendo, press and hold Start and Select while keeping hold of A+B.
4/ Continue to hold these buttons until the Main Action Replay screen is displayed, then release. Your product is reset, and will accept codes once more.

But all the codes you had before will be gone.
It looks like the day you got it.

did you try to clean the ds slot connector?? you should try to clean the action replay cartridge connector pins...Good luck!!!

Your Action Replay DS hardware may require resetting if you are experiencing any of the following problems:

* Code Manager PC software is reporting that Action Replay DS does not contain enough free space when it actually contains no codes.

* Code Manager PC software is reporting the console`s battery is low when it’s actually fully charged.

* Multicolored bars are shown on the screen after you confirm the entry of a game ID when trying to manually enter codes.

* You can use the Code Manager PC software without any problems until the Action Replay DS is connected via USB set to the update mode on the console, at which point Windows shows a run time error.

If you are experiencing any of these problems, please follow the steps below to reset the Action Replay DS hardware. Please beware that resetting the Action Replay DS hardware will not restore a default codelist, and any codes which are stored on the Action Replay DS will be erased.

1. With your console powered off insert the Action Replay DS

2. Hold down buttons A+B

3. Turn your console on

4. With A+B still held down, as soon as you see the Action Replay DS license screen press and hold down buttons START+SELECT so that you now have 4 buttons held down

5. Hold all 4 buttons down for around 10 seconds until the Action Replay DS loads to it`s home screen

6. If Action Replay DS doesn’t hold on the license screen for around 10 seconds when you do this, you may need to turn off and try again

i had the same prob
Your Action Replay DS hardware may require resetting if you are experiencing any of the following problems:
* Code Manager PC software is reporting that Action Replay DS does not contain enough free space when it actually contains no codes.
* Code Manager PC software is reporting the console`s battery is low when it’s actually fully charged.
* Multicoloured bars are shown on the screen after you confirm the entry of a game ID when trying to manually enter codes. * You can use the Code Manager PC software without any problems until the Action Replay DS is connected via USB set to the update mode on the console, at which point Windows shows a run time error.
If you are experiencing any of these problems, please follow the steps below to reset the Action Replay DS hardware. Please beware that resetting the Action Replay DS hardware will not restore a default codelist, and any codes which are stored on the Action Replay DS will be erased.

1. With your console powered off insert the Action Replay DS
2. Hold down buttons A+B
3. Turn your console on
4. With A+B still held down, as soon as you see the Action Replay DS license screen press and hold down buttons START+SELECT so that you now have 4 buttons held down
5. Hold all 4 buttons down for around 10 seconds until the Action Replay DS loads to it`s home screen
6. If Action Replay DS doesn’t hold on the license screen for around 10 seconds when you do this, you may need to turn off and try again

from codejunkies

Your Action Replay DS hardware may require resetting if you are experiencing any of the following problems:
* Code Manager PC software is reporting that Action Replay DS does not contain enough free space when it actually contains no codes.
* Code Manager PC software is reporting the console`s battery is low when it’s actually fully charged.
* Multicoloured bars are shown on the screen after you confirm the entry of a game ID when trying to manually enter codes. * You can use the Code Manager PC software without any problems until the Action Replay DS is connected via USB set to the update mode on the console, at which point Windows shows a run time error.
If you are experiencing any of these problems, please follow the steps below to reset the Action Replay DS hardware. Please beware that resetting the Action Replay DS hardware will not restore a default codelist, and any codes which are stored on the Action Replay DS will be erased.

1. With your console powered off insert the Action Replay DS
2. Hold down buttons A+B
3. Turn your console on
4. With A+B still held down, as soon as you see the Action Replay DS license screen press and hold down buttons START+SELECT so that you now have 4 buttons held down
5. Hold all 4 buttons down for around 10 seconds until the Action Replay DS loads to it`s home screen
6. If Action Replay DS doesn’t hold on the license screen for around 10 seconds when you do this, you may need to turn off and try again

source codejunkies

You can't put an action replay with a TTDS in the same slot. The action replay cannot read all of the games the TTDS has.

connect the usb to the pc.when you power up the ds lite with action replay in palce.press the select,start,A and B button at the same time.this will format your areplay.now update the action replay via internet and it will update all the games on your action replay.