Computer is dead but has an indicator light on

Computer is an Pavalion a1250n. Upon returning from a one week vacation noticed that there was a faint blue light on around the start switch. Tried to start the computer and nothing (totally dead). Light on rear of power supply was on. Removed front on case and saw that there is a indicator light above the start switch and it is on. Thinking the power supply had failed pulled it and checked all connectors and all voltages were correct (got specified voltages on web for power supply). Plugged everything back in and same issue. Contacted HP support and was told it was a bad motherboard. So assuming HP support was correct I got a used board off Ebay and it did not correct the problem. Second guess was a bad CPU. Changed it out also and same thing. Disconnected all accessories and same problem. Disconnected DVD etc and same problem. Pulled memory chips and reinstalled them so be sure they were seated good and no help.
Again pulled power supply and rechecked all voltaged on all connectors and everything looks good. I have looked all over the interned to see what the top indicator light means and cannot find anything. A friend mentioned that if the memory chips were bad it would not start but I don't want to keep putting money into the unit since it is old. Anyone out there with similiar issues or know what my problem is.

I will ask you to perform the Power Supply test. It's a generic text. (Using a volt meter IMHO is not sufficient).
While the case is open, and your performing these tests, keep a watchful eye in the CPU fan and rear case fan.
I am a volunteer. I am not an HP employee.
To say THANK YOU, press the "thumbs up symbol" to render a KUDO. Please click Accept as Solution, if your problem is solved. You can render both Solution and KUDO.
The Law of Effect states that positive reinforcement increases the probability of a behavior being repeated. (B.F.Skinner). You toss me KUDO and/or Solution, and I perform better.
(2) HP DV7t i7 3160QM 2.3Ghz 8GB
HP m9200t E8400,Win7 Pro 32 bit. 4GB RAM, ASUS 550Ti 2GB, Rosewill 630W. 1T HD SATA 3Gb/s
Custom Asus P8P67, I7-2600k, 16GB RAM, WIN7 Pro 64bit, EVGA GTX660 2GB, 750W OCZ, 1T HD SATA 6Gb/s
Custom Asus P8Z77, I7-3770k, 16GB RAM, WIN7 Pro 64bit, EVGA GTX670 2GB, 750W OCZ, 1T HD SATA 6Gb/s
Both Customs use Rosewill Blackhawk case.
Printer -- HP OfficeJet Pro 8600 Plus

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http://support.apple.com/kb/HT1547
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MBP will not turn on but the power indicator light does

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follow the steps given here...
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Need help!
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V3.4R79
RAID1
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Model
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Message was edited by: studabaker
Message was edited by: studabaker

The microUSB cables are fairly common... most portable electronics today use them for file transfer/charging.
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I have the same issue.
The magsafe goes orange for about 20 seconds, the battery shows 0% then it goes to a black X indicating no battery installed.
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Welcome to the Apple Support Communities
Probably the display or the graphic card are damaged. As it's a hardware problem, take your computer to an Apple Store or reseller to get the computer diagnosed and repaired if needed

Computer is dead but has an indicator light on

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