fozzybr

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Dec 30, 2008
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18,510
I have a compaq evo D510 that has a 1.79GHz/400FSB processor that I want to upgrade to a 2.4GHz/533FSB. HP technical manual

http://h18000.www1.hp.com/products [...] 49_div.PDF

says that it will work, but when I put the new processor in, the light on the box flashes normally, the cd rom flashjes as it should , but my screen stays black and nothing else happens. Does anyone have an idea as to what I need to do?
 


Sounds like you need either a BIOS update or a better power supply.
 
I tried to look at the hardware guide for the Evo D510 that you posted, but the link is not good and HP's links to the information (went through their website) are down, too. What exact CPU did you try to put in the computer? The new CPU may be incompatible with the computer as Intel made many revisions of the Pentium 4/Celeron.

First of all, the CPU you have in the unit may be one of several CPUs:
1. Pentium 4 Willamette (180 nm, 256 KB L2)
2. Pentium 4 Northwood-A (130 nm, 512 KB L2)
3. Celeron Willamette-128 (180 nm, 128 KB L2)
4. Celeron Northwood-128 (130 nm, 128 KB L2)

And the replacement CPU may be one of two as well:
1. Pentium 4 Northwood-B (130 nm, 512 KB L2)
2. Celeron D 320 (90 nm, 256 KB L2)

Since I could not find out anything about the machine you were using, if the manual said going from a 1.80 GHz/400 FSB processor to a 2.40 GHz/533 FSB processor was supported, then it is certain that the machine supports running 130 nm Northwood processors at a 533 MHz bus speed. So unless your replacement 2.40 GHz/533 FSB processor is a Celeron D 320, it should work. So I am thinking perhaps you did something like forget to clear the CMOS after the BIOS upgrade or just got a bum CPU. Do you happen to have another socket 478 system around that you can test the new processor in?
 


If it is a P4 with 1 MB L2 cache, then it is a 90 nm Prescott and is NOT supported by your computer. The PDF shows that your computer only supports socket 478 Willamettes and Northwood A (400 MHz FSB) and Northwood B (533 MHz FSB) Pentium 4s as well as their Celeron equivalent (128 KB L2 cache.)

You will want to trade that Prescott you have for a Northwood A (400 MHz FSB) or Northwood B (533 MHz FSB) to upgrade your computer.