Computer won't get past starting windows after case change

Computer worked fine. Changed cases and it stops before the starting windows animation. I tried windows repair, the loading bar goes all the way and freezes. Safe mode stops at disk.sys I can't reload windows because when booting to the disc the loading bar freezes. I put it in the original case and same problem. Took it out of the case, set it on my desk and it works fine. Replaced psu, ram, hdd(tried to reinstall) using onboard video, all with no luck. But everytime I take it out of the case it works fine. I tried the hard drive in another computer with the same mobo and such and it worked fine.
Windows 7 pro 64bit
AMD X2 270
Biostar A780L3B
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More about computer past starting windows case change
  1. You should probably download more ram
  2. So your system works perfectly when not mounted in the case, but fails when inside either the new or old case. That really suggests something wrong in the mounting. Four things I can suggest to check.

    1. When you mount a mobo in a case, there normally are several points on the mobo where you insert screws through a hole and into a standoff stud. It is not necessary to put a screw in every such hole. BUT it is VITAL that the standoff studs mounted in your case should be ONLY where they line up with a hole. Check this carefully. There should never be any standoff (or any other point of contact between the case and the back of your mobo) where there is not hole for a screw. Each hole has a small contact area around it on the back of the mobo that is supposed to make contact with the case Ground. But NO other spot on the mobo should be grounded.

    2. This one I found out by doing it "wrong" myself. I had mounted the mobo in the case and then discovered a problem at the back where the mobo's group of connectors mates with the case's cover plate. At one connector some metal springy fingers of the back plate (that are supposed to go OUTSIDE that connector and make contact for Ground shielding) had instead slipped into the connector, contacting some pins. Had to re-mount and make sure this did not happen again.

    3. Often when troubleshooting outside the case, one does not install everything that would be hooked up when it really is inside the case. So review carefully whether there is anything NOT hooked up when it works perfectly outside your case.

    4. When re-installing into your case, try a part of the breadboard process. Install at first ONLY the bare essentials so you can boot into BIOS Setup with minimal RAM. Shut down and install one more component. Repeat until the installation of a new component causes a problem. That helps identify the source. Could be that component, or its driver, etc.
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