Everybody please help! My self-built computer has got crazy. Please seriously read this post and help me. I appreciate everyone who attempts to help me. Spec: (built in 2010 summer) [mobo] MSI 880gma-e45 (latest BIOS version modded long time ago) [cpu] AMD Athlon II x4 (2.8GHz/core), no OC [hdd] Hitachi 500GB (C, D, E drives) [ram] Kingston 2GB*4 dual-channel [power] Antec NeoEco 450w 80plus [dvd] Lite-on DVD writer 24X Symptom of problem: First, I felt that there were detection problems with my mouse. Then I installed Kaspersky IS 2011 with the latest virus definition and carried out a long complete scan on my HDD. It was found that there were 2 trojan horses in the AppData folder so I removed them in Kaspersky. I carried out another scan and I had set it to shut down my PC after scan. However, it had scanned for approx. 8 hours and it NEVER stopped (showing 98%)! I manually stopped it and started another complete virus scan. I was watching some videos and surfing the Internet meanwhile. Then the monitor immediately TURNED BLACK and DISPLAYED NOTHING... WTF!!! The Num Lock key could still be switched on/off but pressing any keys such as Ctrl+Alt+Del was meaningless at all. I was forced to press the reboot button on my PC case but there was still no response. Therefore, I held the power button on my PC case and my PC was finally switched off. Discription of problem: After I switched off my PC, I could NEVER boot my PC to the BIOS screen! Normally, when it booted to the BIOS screen, there was a "beep" sound from the motherboard. However, there was no such "beep" sound after I switched on my PC. The PC was on but NOTHING happened to the monitor screen, the keyboard lights, only the optical mouse' light was on and the light on my PC case. The DVD writer could be opened. Question: How can I help my PC from booting? I want to get at least my data back. Did Kaspersky IS 2011 mess things up? Was my PC infected with BIOS viruses? How to tackle the problem? Was there a possibility that there were bad sectors in my HDD? Please suggest some ways to fix it. Thank you!!!