Computer refuses to turn on!

[Hyper]

Upgraded a friend's computer today from a PIII to AMD 2600xp.

Took out the motherboard, cpu, ram and video card and replaced them with:

Asus A7N8X-X
AMD 2600XP (333 FSB)
128M Winfast-A280 TDH-GF 4 4200 8x VIVO
1024 MB PC2700 DDR Kingston ram

After fiddling around and replacing the parts, I thought I'd boot it up just to see if windows98 still works. It boots up fine (omg wtf?) and sits there dectecting new hardware. While this is happening, it decides to freeze (no surprises here) then without warning, it just turns itself off.

After turning itself off, it refuses to turn on again. Any ideas what it could be?

[Frodo]

Does it power up at all? Ie - do the fans spin up and the computer beep / leds light up etc?
If it doesn't.. chances are the powersupply is blown.

[Hyper]

That's what i initially thought, but the monitor turns on when i press the power button (monitor power is connnected to the PSU). Perhaps power from the PSU to the motherboard blew?

[Doso]

Originally posted by Hyper
That's what i initially thought, but the monitor turns on when i press the power button (monitor power is connnected to the PSU). Perhaps power from the PSU to the motherboard blew?

sometimes if the PSU is blown most things like the cd rom etc still turns on but the PSU is still screwed

also please tell me use used thermal pad/paste on the CPU

[SLATYE]

Check the heatsink is mounted properly. It fits on two ways, but only one way actually works properly.

[Frodo]

You can usually smell the cpu frying if the heatsink isn't put on properly.. if you're sure it isn't the PSU, i would take a look at the motherboard.
Get another PSU and test it in your friend's computer if u can.

[thetron]

Also check the motherboard for any burnt bit like this

http://www.lexicon.net/thenelsons/oc...eburn_mark.gif

I took my ASUS 8x deluxe to Jesters place for testing

With your system it's farely *new*. so this mean you should have the Speech Bios reporter.

To test your system out. All you need is the Bare Motherboard (layed out on a bench with soft protection and anti-static mat) with Everything off the board. No Cpu and HS, PCI/AGP and finally the ram removed from the system
We only want the motherboard and the PSU connected to the motherboard with a Power switch to turn it on. Also, the plugging the speakers to listen for the POST Lady taking

thetron's Process of elimation
1. Once your set the motherboard and power supply is setup, Turn the System on @ the switch.
When you turn the system on you should notice a little LED light switch on the board, If it's Lit up and Green your system is Live, confirming that you have power from the PSU
2. Make sure your speakers are switched on and connected to the onboard sound and connect your keyboard also
3. Turn the system on.
4. Sign of life
- Your Keyboard LED Flash meaning that your keyboard has passed it's POST Test
- The Bios Beep Codes and the POST Lady should be saying "No CPU Detected"
5. You don't Get a Voice then your borrow another 300-400w PSU and plug it in and repeat steps 1-4.
6. If your Bios boot then with a different PSU Unit then you know the PSU unit was the cause (skip step 7)
7. If your system doesn't boot. Then it's Faulty and time to fill an RA form in.
8.Grab a Working Mates system that can support your CPU and test your CPU in his system (without ram)
If the system doesn't boot in that system then you know the CPU is dead. If it does boot this Reconfirms that your motherboard is faulty and needs to be RA'd ASAP. Same if the the System doesn't boot with your CPU. Send it back!
9. Now try your ram in your Mates system with his CPU this time (we leave out your CPU from this test)
- If it Boots, You know that it's the motherboards Fault
- If the system doesn't beep it's Faulty Ram.
10. Now try AGP card in your Mates system with (Mates cpu and ram)
- if it boots your AGP works
- doesn't boot/display any picture then your AGP is faulty

You what i'm getting at mate. The process of Elimation?
In short term in case you don't know One by one you gradually connect parts one by one

[Hyper]

Thanks for the great suggestions guys, i'll try them out.

[Hyper]

Thanks guys, it turned out it was the shonky yumcha PSU. It has been replaced with a Antec 380W and runs perfectly.