Continuos interval 4 beeping sounds with blinking red light, then shuts down.
4 beeps & 4 flashes mean problem with the power supply. For my experience, most of the time the PSU is good, it is just overloaded.
For more LED and Beep messages, check this link:
http://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/c00067072/c00067072.pdf
Thats a sign of bad ram you will have to udate your ram
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When i try to press the power button on my compaq computer it just blinks red and doesnt stop. at first i assumed it was the power supply and checked the plug, etc. but nothing was wrong. when i unplug it, it keeps blinking. this computer has worked fine tin the past and i haven't installed and new hardware or software.
4 Beeps: System timer failure
Explanation: There is a problem with one or more of the timers used by the system to control functions on the motherboard.
Diagnosis: This is usually a motherboard failure.
Recommendation: Troubleshoot the motherboard.
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