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Mac Plus "happy mac" freeze during bootup

Hi, 

having problem with my Macintosh Plus, it never manages to boot operating system, instead it freezes after a while (like 5 seconds) of reading data. Doesnt matter if I try to boot it from floppy (100% bootable floppy inserted in working internal and external drives) or external hard disk with bootable System 6 (tried with other Mac) it's always the same, freezes with happy Mac icon (as seen on screen). 

IWM, Bourns Filter? What should be tested first?

happymac.jpg

 
ok not really freezing... as it stops booting from hard disk I can insert floppy and it's trying to read it, but no success. 

Another thing is it correctly ejects non system floppy and I can manually eject any floppy with mouse button pressed, so I guess IWM chip is ok?

 
Problem solved. Removed R8 resistor "256k bit memory" and used 4 x 1 MB memory chips (instead of 256 kB ones). Works smoothly! 

 
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