Computer will not boot

by steeldetails Sep 5, 2010 4:51AM PDT

My computer will not boot. Fans all come on including the cpu. DVD drive lights up, but no HDD activity. I have cleared CMOS.This was done as when it started, it would run for about 8 seconds then shut down.
It probably started when I made small changes(CPU ratio 15.5 to 16) to the BIOS setup.When I did the save and exit, the dialog box came on and said that it was saving the changes, but then it just shut down and didn't load windows. Any ideas?

Gigabyte MA790XT-UD4P
AMD Phenom ll 550 Black Edition
Powercolour Radeon HD4870 512MB
Antec Earthworks 750w
200gb Seagate Barracuda
Windows 7 Ultimate

Discussion is locked

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Sorry I had to deduce the Amperes required for this card.

by r. proffitt Forum moderator Sep 5, 2010 6:10AM PDT

http://www.amd.com/us/products/desktop/graphics/ati-radeon-hd-4000/hd-4870/Pages/ati-radeon-hd-4870-system-requirements.aspx gives us a clue that we need up to 150 Watts just for this card (the difference from the single to dual SLI ratings and the dual 75 Watt connections.)

That's 12 Volts so the rail you connect with must be rated at more than 15 Amperes to be on the safe side.

BUT the REAL cause is likely to be the BIOS tinkering. Try resetting the BIOS so it will load safe values.
Bob

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will not boot

by steeldetails Sep 5, 2010 6:28AM PDT

This mb has dual bios. Shouldn't resetting the cmos take care of this?How do I reset if it will not boot?
Thanks for the reply

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You're right.

by r. proffitt Forum moderator Sep 5, 2010 6:35AM PDT

If clearing or reseting the BIOS fails and you have unplugged all things USB then it's time to ask the board supplier for the RMA.
Bob

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RMA

by steeldetails Sep 5, 2010 6:50AM PDT

Hey Bob,
Don't say that. I bought it used about a week ago. It worked fine till I entered the BIOS setup.I have also emailed Gigabytes tech supprt on the matter. It didn;t seem right after saving the bios that it would just shut down. When it started it went into bios recovery but said that HPA Bios not available. Then it retrieved from the backup. Neil

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problem solve-I think

by steeldetails Sep 5, 2010 11:35AM PDT

It looks like 1 of the memory was not seated tightly in.
Was able to start it!!!!!
Now I am looking at CPU-Z clock multiplier just dropped from 15.5 (normal) to 4. The core voltage has also dropped to .992 from 1.344v. It is oscillating from low to high with values in between, but more at 4 and .992. What is this maybe a loose connection?
This is a AMD Phenom ll x2 550 Black Edition

Computer will not boot

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