Hi, I'm pretty knowledgeable with computers but a novice when it comes to power supplies. Just looking for a little help from some of you experts about whether or not my power supply is 'powerful' enough. I have been concerned about this as my PC has recently been acting up. The picture tends to freeze for a split second continuously and the sound cuts in and out when I'm watching videos/TV and sometimes when I'm just starting up Windows. Is this a typical symptom of an underpowered PC? Here is my setup: HP Pavilion a1600n PC (looks like it has a Bestec 300w PS) Windows Vista Home Premium Athlon 64 X2 3800+ 3 GB RAM (2x1GB + 2x512MB) 3 HDD (1xIDE, 2xSATA) DVD Burner (IDE) BFG 7900GS OC Graphics Card Hauppauge HVR 1600 Hybrid Tuner Card I tried eXtreme Power Supply Calculator v2.5 and it said 297w, so technically I should be ok according to that. But I'm really looking for some advice as to whether or not my symptoms are typical of an underpowered PC and what my next steps should be. If my stock power supply is not enough, can someone please recommend a replacement? I'd like it to be quiet and have enough power, but I'd like to avoid spending more than I have to. Thanks in advance for your help!