No Boot But Power To Everything

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Alan 29

Reputable
Mar 23, 2014
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Hello Everybody and Anybody. My computer failed to turn on one morning-absolutely nothing. It is an HP8530f, Asus mobo M2N78-LA, Win 7 OS, 4 GB of RAM. I played and eventually got power but I could not control when the power would come on, it was erratic. So, I installed new PSU and got power to everything including HDD, CD re-writer, all fans, etc. all the time, even with the power button removed from the computer and mobo. (that seems strange) I removed the power button thinking it might be bad and kept it removed . The CMOS battery was removed and it measures 2.4 volts (3.0 new). Visual inspection of mobo shows capacitors as having no issues of leaks, swelling, etc; they all look good. I removed and re-installed all four modules of RAM and turned power on again from the switch on the PSU. Again lots of power but no boot up.

Bottom line is everything began with loss of power. Now I have power to everything all the time with the power button removed from mobo, but system will not boot. Monitor is a dvi Dell connected to dvi on the computer mobo if that means anything. Any ideas from anyone please? Than you.
 
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Calvin, thank you for your assistance regarding the CMOS battry. I just found the problem.

The mobo is burned on the back, behind a 1.5" x 1.5" heat sink installed over a chip I guess. This is not the CPU heat sink and fan assembly. I took a picture, but I do not know how to attach it to this forum message. Also, one of the SATA connectors on the mobo was ripped off the board and the small wire terminals were touching each other; could these sata wires cause the short that burned the mobo?

For anybody who wants to know, my the first observation was the indicator light on the back of the PSU dimmed each time I plugged the 24 pin connector from psu into the mobo, which indicated a short circuit or draw. So I removed the CPU...
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Calvin7

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Feb 19, 2013
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It is recommended that you change the CMOS battery every 5 years. The open load of a new CR2032 could measure 3.1-3.2 volt. The only way to reliably check/test a cell, is with some kind of a load. The depleted 2032 cells drop drastically when loaded with a 100Ω resistor.

You can make a short jumper with alligator clips at each end and a 100Ω resistor in the middle. If you take one alligator clip from this load jumper and clip it to the positive probe of your multimeter and the other alligator clip to the negative probe you can test the voltage of a 2032 cell under load.
 
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Alan 29

Reputable
Mar 23, 2014
6
0
4,520
Calvin, thank you for your assistance regarding the CMOS battry. I just found the problem.

The mobo is burned on the back, behind a 1.5" x 1.5" heat sink installed over a chip I guess. This is not the CPU heat sink and fan assembly. I took a picture, but I do not know how to attach it to this forum message. Also, one of the SATA connectors on the mobo was ripped off the board and the small wire terminals were touching each other; could these sata wires cause the short that burned the mobo?

For anybody who wants to know, my the first observation was the indicator light on the back of the PSU dimmed each time I plugged the 24 pin connector from psu into the mobo, which indicated a short circuit or draw. So I removed the CPU and then checked to see if draw was still there and it was. Then I removed mobo for visual inspection on the back and found the burned area on the back.

How do I attach a picture here??? TY.

 
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