Posts: 1
Member Since: ‎12-01-2011
Message 1 of 2 (2,519 Views)

Desktop Computer doesn't turn on

Hey I have an HP Pavilion a6742p and I can't get it to turn on, when I press the power button the green light on the back of my computer turns off. I figured out that if I disconnect the power plug and reconnect it or if I hold down the power button for about 5 seconds the green light turns back on but the computer does nothing. I tried disconnecting the power source from everything and reconnecting and still nothing. The computer stopped working after a power outage ocurred, but when it ocurred the computer wasn't even on. Any ideas on what's happening?

Associate Dean
Posts: 5,627
Member Since: ‎09-28-2010
Message 2 of 2 (2,493 Views)

Re: Desktop Computer doesn't turn on

[ Edited ]


First of all, welcome to the user forums.

The procedures for tesing the power supply are here:


The specs on your unit:


The power cord supplies a minute voltage to the PSU and motherboard in the OFF position. That said, IMHO your old 250W PSU has not survived a power spike.


Good news is that your in the position to make choices. New PSU, and maybe a nice PCIE graphics card.

An energy efficient PSU can save you $$ in the future. The meaurements are important. These units are all 5.9 x 3.4 x  "X" long. The "X" is depth into your case. The PSU in your case is 5.5"  L (or depth). Some of these listed below are longer.

Rosewill (exact fit PSU's):


You need to measure for these.



If you elect to also upgrade the graphics,  ask.


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(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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