Is there a cpu upgrade for an hp pavilion 6835 with a motherboard 115561 cognac 20000731

Your motherboard is limited by it's 400 fsb. The fastest CPU that will work in it is a 2.8Ghz 400fsb northwood chip. You can upgrade the memory to 1GB of pc2100 ddr ram. As for changing out the motherboard, don't do it. The front panel connections will likely never correct correctly with a new motherboard.

Motherboard supports the following processor upgrades:

• Intel Core 2 Quad (Y) Q9xxxx
• Intel Core 2 Duo (W) E8xxx
• Intel Core 2 Quad (K) up to Q6600
• Core 2 Duo E6x00 (C) up to E6700
• Core 2 Duo E4x00 (C) up to E4400

If you are getting absolutely nothing when you hit the power button, then you most likely have a bad power supply. Replace with an upgraded power supply (manufactures use the cheapest thing they can find).

Hope this helps

Any Pentium 4 northwood or willamette CPU should work, when ordering your CPU make sure is for socket 478, you can use up to 2.80 Mhz speeds on that motherboard. you can get those on ebay for a good price.
Hope my opinion helped. :)

upgrading just the CPU is a waste of money. Consider upgrading the to more memory instead.

the socket coloured with green is of head phones and pink is of microphone

Here is what your motherboard can handle:

Supports the following processors:

AMD Athlon 64 X2 up to 4800+
AMD Athlon 64
AMD Sempron

Reference: HP Pavillion a1410n
See Product Information>Product Specifications>Motherboard Specifications

Thanks for using Fixya.

windows 2000 is the main problem for this. the operating system has limited drivers for the drive. have you installed service pack 4 if this dont help go to the teac website and upgrade the firmware for the drive.

Here is the support webpage for you model which may show you some things. It doubt that it will give you a wiring diagram.  To receive that you would have to know who made the mother board, then cross over the board numbers.
http://h10025.www1.hp.com/ewfrf/wc/product?product=3771735&lc=en&cc=us&dlc=en&submit.y=3&submit.x=8〈=en&cc=us

Socket type: mPGA478 (P4).
P4 – 1.4-3.4 GHz
P4 EE 3.2-3.4 GHz
MOTHERBOARD MANUAL: http://www.elhvb.com/mboards/OEM/HP/manual/danube_manual.pdf
It shows you how to take off and put in the CPU.
This is a guide on how to install the CPU/with FAN.
http://www.pctechguide.com/tutorials/Pentium4_CPU.htm