Atari 520 with Glitches

[spawnerbr]

I got an Atari 520STfm and a 520STe that are with a strange behavior. I have a pack of games that I use to test the Ataris and some games are crashing the Atari screen. I have some pictures of the crashes:

F29

MIDNIGHT RESISTANCE

DRAGON SPIRIT

This games I have teste on others 1040STf and 520STfm and they ran with no problems. I have tested too, just to know that the game disks are fine, all the games on Hatari with TOS 1.00 UK and 512MB and everything ran fine. Then I converted the disks to .ST and sent to a friend that tested on his 1040STf and it ran with no glitches.

Any idea about this????

[tjlazer]

reseat all socketted chips, or perform the Universal Atari 4" drop