Initially, I couldn't access anything. The power light would come on but the screen would stay blank. After numerous attempts, I managed to get a boot screen that said CMOS Checksum Bad. I went into the BIOS and found that the clock had reset. I changed the time and date back to the present, saved and exited and Windows started. I noticed, however, that the clock had added an hour. Each time I started the computer after that, I would get the CMOS Checksum Bad message, the clock would reset, and I would either have to change it through the BIOS or within Windows. I'm presuming my CMOS battery might be dead, or at least I was presuming that until I just started my computer a couple of minutes ago. This time it booted up correctly!!! Maybe it's a bad connection or maybe the CMOS battery is on its way out and is failing intermittently? I really don't know.