Thanks Tony, I have 4 sims installed, i believe 4 mega bytes, this is also indicated on startup. I did try swapping ,rotating and reducing the sims, but observed no change. I am not able to boot with the scsi card installed, when I remove it i am able to boot from the service disk and also install system software. Yes i did press the relevant keys in both scenarios and no success from booting with the SCSI installed. Yes the settings look correct. Is there a way to do a hard reset which takes the system back to factory settings? And for me to renter all data? I highly suspect a memory issue and therefore suspect u26 and u36, are the checksums available? -- Regards, Kevit Desai Tel: Mobile: +254 722 517067 _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/