It's my brand new Proscan TV/DVD combo. TV (on Comcast Cable) works fine; but I cannot get the DVD to work. I can't get past Step 1. The screen keeps saying "No Signal"/

SOURCE: blue screen with HDMI

Check the power supply modular cable connection that is by itself in the upper right corner.  On the one my son-in-law has the double yellow jumper wire that connects to this plug in two locations was loose (not properly inserted) in the modular connector and had worked it way out. 

SOURCE: no signal

can you double check the signal cable that its going to the right place?

I beleave its hooked up wrong.

SOURCE: Weak or no signal

you would need to know if the tuner is picking up analog signals in the air well( stick a wire a little bit in the tuner connection to see if channels pick up good or use an antenna , if so there should not be a problem with the cable being hooked up to it , if there is a problem even with an antenna then the tuner is bad and will need to be replaced , and the cable could have caused it to go out , but make sure that the tuner is working or not first.

SOURCE: proscan tv surround sound hook up

This depends on whether you have digital cable box or not. If you have a Digi Cable Box look for the red/white RCA output and connect this via RCA cable to the Red/White Audio input on your surround.

If just Basic Cable look for a red/white audio output on the back of your televison. connect this to the Red/white in on your surround. Could be called tv in or auxillary.

SOURCE: i need a code for my proscan tv/dvd combo 32lb30qd

If you have a 4 digit code try (0178).