I had these (intermittent) issues as well. Machine would not boot, and when it did sometimes the gameplay seemed ok but when progressing through the game the graphics would get garbled up and/or the machine would spontaneously reset (in retrospect this was hinting at game rom connectivity issues). Caps looked fine. Installed a better power supply. Tried reseating the prism card, which sometimes seemed to work, at least initially (until the garbled graphics followed by spontaneous resets showed up). In the end what completely resolved the problem was to take the prism card apart, take out the game roms, clean the chip and prism pcb contacts with stabilant 22 (a contact-enhancing non-conductive fluid that turns into an insulating conductor when under power/current), and rebuild everything. I've not had any problems ever since.