Soft sound I just got a second hand game boy color (my old one is with my brother), it looks very new on the outside, but the sound is really soft/low, even though I put it on full volume. The thing is that I didn't have proper batteries, so is the low sound due to the low batteries? I cannot remember. Thank you!

SOURCE: DS Lite - game boy advance game - delete saved data?

Do so how you normally would when playing the GBA game on a GBA (It best be a GBA game, because DS and DS Lites cannot communicate to older Game Boy games), go through the menus (on the game) and delete the files. It's not a matter of the DS having the problem it's the game.

I've went through the menu's and deleted the game but my game still has "corrupted data":

First, do all you can do, clean out the slot in the DS Lite, and the cartridge (with a damp, NOT SOAKING WET, cotton swab), and try the game again. Start a new save file, save it after a ways, and try to load it again. IF it -STILL- has a corrupted save file problem, then it is time to bring it to the seller or the manufacturer.

The seller: Telling the seller what's happening is great. BUT SHOWING the seller that the save data never loads really helps! Customers can say quite a few things to Sellers just to get a new game or their money back, but showing them is pretty much proof. No, you don't -HAVE- to show them, but if the seller is -that- skeptical, it may be wise to bring your DS along with you.

The manufacturer: All games have a Technical support call number, also going to nintendo's main site,www.nintendo.com/, and going straight to their technical support pages helps too. Sending it in will warrant a little wait time, but if done correctly you will receive a fixed or new game from them as well.

SOURCE: my game boy color doesn't turn on

theres a broken connection somewhere if even the LED doesn't even come on. I doubt theres even an internal fuse on the gameboy.
The only thing you might be able to fix was a faulty on/off switch - have you tried shorting the switch contacts with something metal?

SOURCE: Game boy color game won't play

You cant fix the cartrige as you will break it
overall its time to let go of the game boy color games try getting a DS its much better but back to your problem... IT IS NOT THE CARTRIGE!! your game boy will not accept the cartrige because of the mechanics in it deteriorating

SOURCE: DS Lite won't recognize DS cartridge

a wire is probably misplaced.I recommend getting professional help or unscrew your ds and fixing the problem.

SOURCE: Nintendo wont charge or turns on. F1 & F2 fuses are good.

Mine has the same problem. I bridged the two fuses, but it didn't fix it at all.
The corrosion indicates it might have gotten a drop of water (or something) in it. A single drop of anything -- spray from glasses cleaner, sweat, leaving it in the bathroom while you shower, condensation from bringing it from the cold -- could all potentially do the thing in. Check to see if there's a little pink square on the inside of the DS: I think that's the moisure "alarm"
I tried another suggestion about cleaning the contacts on all the ribbon cables, however I did the thing in permanently in the process. They're really not meant to be repaired with ordinary tools -- although they could have been... it's just a design decision that was made. At this time I was just spending the extra effort to make it useful again because I can't stand waste (although I realize now that it's largely disposable, and I have to keep buying them to get my return on the investment in carts!)
They're pretty fragile things in general.. for a toy. A little plastic seal could have prevented many thousands of these things from konking out. That, and the complete lack of official information except to send it in for repair at 80% of the cost of a new one makes me wonder if they make more money from the repair business as the initial device sales!