I've had my Spider IV for all of three months. I love it, I love the sounds it gives me.

What I don't love is that today, I wanted to play guitar, and plugged the guitar straight into the amp to play, and I have this irritating white scratchy noise that happens every 5 seconds. It sounds like a pulse. It starts every 5 seconds, lasts for about a second and a half, then stops. It is as loud as my guitar when I'm playing, even with overdrive/distortion.

I've tried factory resetting it, using different outlets, (ones that I know have worked before) and using different guitar cables.

The funny thing is, it only makes the sound when something is plugged into the GUITAR IN or CD IN. If nothing is plugged into it (sonically), then it doesn't make the noise.

Please, please help.

If I need to, I can post an MP3 of it.