Ram is the same on the SE/30, but keep in mind that you have a resistor to cut accordingly.

http://www.hardwaresecrets.com/inside-the-macintosh-se/5/

Another possibility is the PSU not producing the required output, but again the PSU from the SE/30 can be used, IIRC the board from the SE can be used in the SE/30 for a test.