Some games reboot my 360

[kingdruid]

Xenon with freeboot

Ok so I had this issue after taking my box apart. I have the 3.5 HD mod and had been playing Red Faction without a problem, but the box was getting to hot so I decided open it up and add another fan.

After I booted the machine back up it wouldn't turn on completely. it would just get to the logo and freeze or not turn on at all so I removed the fan and started the xbox and it came up fine, but when i try to play red faction/crackdown/wwe smackdown it freezes up then restarts the xbox.

Another thing that did happen when I plugged the box back in is I forgot to change my IP gateway and because of that my box was on live and I was banned. (Not sure if that has anything to do with it, but I have restored my original hacked NAND)

Steps I've taken so far:
1. Flashed hacked NAND again
2. tried another 3.5 drive and re backed up my games to that.
3. Removed part of the 3.5 mod - the sata cable under the board and I am now using the 20GB stock HD.
4. So far I only have Red Faction on the stock drive, but I'm still getting the same results(freeze-then reboot).
5. Loaded game on USB drive under the /Games folder. (Used XEXmenu to load it)
I picked wrecking crew and told it not to load a profile to save my progress in Red Faction and it loaded fine. Then I tried the same when pressing new game and it turned off again.
I also tried WWE RAW 2010 and uploaded the same way.
wwe raw freezes up then reboots during the opening logo, but Cloudy with a chance of meatballs and Halo 3 work fine. Ran HALO ODST and that tells me the disk is dirty.

Someone please help me out?? At this point I'm not sure why this is happening and have tried everything I can think of.

Another thing was my original nand did not have any bad blocks. Even when I reflashed it before all this happened and created a backup that backup did not have bad blocks.

Now after I flashed my original NAND back on it did not help, but I tried dumping the NAND again using freestyle dash and it told me it had bad blocks:
Bad Block found @ 0x3a5

Any ideas anyone? I would really appreciate some help I would rather not have to buy another board off ebay to get this to work. Could my NAND be damaged when I put it back on the board? I would think if I flash it then dump it it should match with no bad blocks, but it doesn't. If it is getting corrupted is there anyway to fix it?

[Gazcoigne]

you could have RROD coming

or the RAM chips may have a cold solder joint thet is making and breaking contract every time the console heats and cools

reflow the GPU and top RAM chips and replace the thermal paste with silver 5 or any other high quality paste

[kingdruid]

Could that be why my NAND now says it has bad blocks?

I tried building a new NAND freeboot image using the current one on there with the bad blocks and it rebooted during the opening cutscene instead of me loading a level. I then reflashed the NAND I had previously and its back to rebooting when loading the first level.

I also noticed that the crackdown 2 demo tells me the disk is dirty when I try to load it. I also tried using other drives and had the same problem.