Heap block. Every time the doors are opened,cash can removed they set errors and stack once it reaches it's limit it will shut you down. You have to --with power off install the e-key 7 and appropriate diagnostic and power on and wait --boot to the diag. screen. In right top select non-volitile--enter, Then only clear the top 2----------NOT the hard drive. If that works for you you would just need to set up the games again using e-key 7 only. Prior to that after a clear and re-boot you will have to turn the jackpot re-set key as advised by the prompts. This will clear the pci and accounting etc. --does not affect the hard drive--the games will still be there. Hope that helped.