You should use machined pin sockets for all the DIP ICs. These hold the ICs beter than cheaper sockets and make troubleshooting easier. You may feel a click as a loose IC is reseated in its socket. In addition, you may have the wrong component installed or installed backwards. The parts should match the outline on the board.
Diodes have a band on the cathode and on the board.
Very few mark the negative side, look closely to make sure. Non-electrolytic caps and resistors are not polarized and can be installed either way. A few completely enclose the tab. Align the tab or the unmarked side of the regulator towards this bar. VR4,5 and the transistors have a half moon outline.