Budget 0-20k PC build with used parts for Chrome surfing and Youtube

I want to build a PC with Core 2 Duo/Quad 3+ ghz/2.5+ghz ,a motherboard of compatible socket which supports atleast 8GB of ram, though I will use only 4GB ram now.No dedicated graphics card
Cheapest branded PSU to power it.A SSD of sub 100 GB Amd a compatible cabinet.

Said unboxed CPUs are available in Amazon at 1000+-, I can get one from there and also the motherboard and other items or can also take from reputed members here who are planning to upgrade.

Points to consider please.
1. Electricity consumption is not an issue as I will use it one hour max in a day.

2. Will be used for Chrome surfing , and Youtube and 9gag.

3.monitor I will decide based on the suggested motherboard video ports availability.

4.its a very tight budget build as I will bring my laptop from home when I go there.

I am currently in kochi ,would prefer to pick up items by hand if I find a good deal from any member here.

Previous Laptops

1.COMPAQ C791TU Celeron 2.13 Ghz ,DOS, got it in 2007 my first laptop was running on Ubuntu 8.04 sold

2.Toshiba C660 Pentium dual core,DOS , got in 2011, upgraded the HDD to 1TB and RAM to 8gb myself.sold

3. Dell Inspiron 3551, DOS, got in 2015, used same 8gb RAM and HDD of last laptop. Current laptop

I am satisfied with performance of all my three laptops though they don't have top of the line hardware , they are entry level notebooks and I have run NFS most wanted ,CS 1.6 on all of them ,not high fps but playable enjoyably.
Seems I am feeling emotional now ,lol.
Anyway this is my first Post here though I have been reading Techenclave for as long as I could remember ,please suggest me some barware in my criteria and thanks in advance.
Please let me know if I need to provide some more info.

Thanks Members for the suggestions, i concluded that with this budget a decent desktop is not possible.

So I will get a laptop.

Thanks once again.

I purchased Avita Essentials from Amazon for Rs. 17,190/-

Intel N4000 upto 2.6ghz
4GB LPDDR4 RAM
128GB SSD
14" Full HD display
Windows 10
-----
Switched out of S mode
Turned off features such as Explorer etc
Uninstalled unnecessary bloatware including trial version of OFFICE 365
Using portable ubuntu from a USB 3.0 pendrive for office work and windows 10 for movies/ games
Only tried NFS Underground till now which works at full resolution.
Looking for drivers for windows 7 as I like gui better, no luck till now.
Tabbed browsing in chrome works fine I have opened upto 20 tabs.
If you are on multiple tabs and when when you switch tabs the page will reload.
SSD is fast boots quick. Using MicroSD 128gb I already had as additional memory.
If anyone has any questions regarding this laptop I will be happy to answer.
Thanks and regards.

The build of laptop seems fragile, unlike my previous Laptops. It's serving my purpose though.And it's been only a day since I got it so don't really know if problems will occur later. To be honest I have a bad feeling about this laptop.