Need to know what operating system, and what you mean by "no signal". Did you start the computer and nothing shows on the screen, or does it start to boot up but never gets to the operating system? If nothing ever shows up on the screen, test the monitor to make sure it's working. Some models with not boot if no monitor is detected. If it shows the boot up screen but never the operating system. Press F8 while booting and try to get in under "safe mode" then reboot to see if that gets you in. If not, then under safe mode, scan for viruses and such to see if a malware has gotten in to the system. I suggest Vipre Rescue, as you can boot with it and have it check the system without loading the operating system.
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